The 68-year-old PM approved the measures during a federal cabinet meeting during which the law ministry presented a draft of the anti-rape ordinance, GeoTV reports.
Pakistan was recently shaken by the kidnap and rape of a mum and her four-year-old daughter were held for two weeks after being lured with false promises of work.
Their horrific ordeal began when they met three men in a hospital who said they would pay her a large sum of money.
Giving his blessing to the new measures, Khan said: “We need to ensure a safe environment for our citizens.”
Convicted rapists in Pakistan face up to 25 years imprisonment or the death penalty.
But bringing perpetrators to justice is hindered by ineffective and slow investigation and prosecution.
In the wake of the rape of a woman on a motorway in the city of Lahore, Khan recently suggested said convicted rapists should be publicly hanged or surgically castrated.