The Chinese-owned site has fought a series of legal battles with religious activists and authorities in the nation, and was shut down for two days earlier this month on the order of a provincial court.
"The action has been taken due to continuous presence of inappropriate content on the platform and its failure to take such content down," the telecoms authority said in a statement.
A local TikTok representative did not immediately comment.
In June, TikTok said it had removed more than six million videos available to Pakistan users in just three months following complaints from officials and ordinary users.