A high court in the northwestern city of Peshawar said it was ordering the ban after a private complainant said the social media app was spreading indecent content, said Jehanzeb Mehsud, a lawyer who represented the PTA.
TikTok's representative in Pakistan said he had heard about the court order and the company would issue further comment in due course.
The South Asian Muslim majority nation had previously banned the app in October, but restored it within 10 days after the company vowed to block all accounts involved in spreading "obscenity and immorality."
The telecom regulator said the social media company had agreed to moderate accounts in accordance with local laws.
TikTok has been one of the most-downloaded app in Pakistan behind WhatsApp and Facebook.
TikTok, owned by China-based ByteDance, has become hugely popular in a short period of time, by encouraging young users to post brief videos.