Speaking in the European Parliament on Tuesday, Yuriy Lutsenko, the prosecutor general of Ukraine, said everyone from white collar criminals to "Mafia-style" organisations and oligarchs would come under his radar.
He said, "The overall aim is to renew public trust in our state institutions and pursue those who steal or are corrupt."
Lutsenko said the reforms also amounted to a further attempt to "demolish the post-Soviet system."
Lutsenko was addressing a news conference ahead of a hearing in the European Parliament, also on Tuesday, on recent judicial reforms in Ukraine.
Reform of the judiciary, which in the past has been notoriously corrupt, is a key part of the association agreement between the EU and Ukraine.
Ukraine's Parliament earlier this month approved judicial reforms that western backers say are needed to fight corruption, in the first constitutional vote the ruling coalition has pushed through since an overhaul of the government in April.
A bill was enacted which aims to curb political influence on the appointment of judges and limit their immunity in case of malpractice.
Speaking at the same event, Pavlo Petrenko, Ukraine's justice minister, said the reform is aimed at making judges more professional. It partly limits their immunity from prosecution, which used to be unconditional. From now on they will be appointed by a judicial council rather than Parliament, which is intended to shield them from political meddling.
Bribery in the court system is seen as a major obstacle to Ukraine's broader reform effort under a €15.6bn International Monetary Fund bailout programme that political infighting has threatened to derail.
Petrenko said the reforms "send a good signal" to the EU and the rest of the international community, adding that it will pave the way for an "independent judiciary, a new court system."
"The message is that Ukraine has started to implement some radical reforms which will meet European standards," he said.
Further comment came from Pavel Svoboda, an EPP group member who chairs Parliament's legal affairs committee and described the new reforms as a "major development."
The Czech deputy said, "In terms of Ukrainian reforms we are living in very interesting times."
Croatian EPP member Andrej Plenković, who chairs the delegation to the EU-Ukraine parliamentary association committee, praised Kiev for "making a lot of progress" in its reform process.
Also attending the public hearing was Oksana Syroid, deputy speaker of the Ukrainian Rada, or Parliament, who cautioned that it may be "an entire generation" before the effectiveness of the reforms can be fully assessed.
"What people need to understand is that this process has been taken place against the backdrop of an ongoing war with Russia. This is the reality of the situation," she noted.
On the same panel, Jan Tombinski, EU ambassador to Ukraine, said that while Ukraine will later this year mark 25 years of independence, not all its state institutions had always enjoyed full independence.
"The aim of these judicial reforms is to make Ukraine more resilient and its state institutions better trusted by its own citizens."
Speaking earlier this month, EU foreign affairs chief Federica Mogherini and European neighbourhood policy Commissioner Johannes Hahn said they hoped the reforms would pave the way for other changes to the constitution, including a law to give greater independence to regions that is required under the 'Minsk' peace deal with pro-Russian separatists.