Authorities are calling on residents to grass up neighbours, friends and relatives breaking the new law.
Those caught face their children being taken into care and sent to “receive rectification” at school.
The law comes into force in Xinjiang province, where 58% of people are Muslim, on November 1.
Under the rules, parents can”t “organise, lure or force minors into attending religious activities”.
According to the state-run Xinjiang Daily newspaper, it also bans promoting “extremist” beliefs to children.
Youngsters whose parents cannot protect them from “harmful extremist or terrorist ways” can be made to move schools.
Instead they can apply to specialist schools where they “receive rectification” as part of their studies.
China guarantees its citizens freedom of religion within what it deems to be “normal” bounds.
Thus citizens can only officially worship one of five religions recognised by the regime.
These are Taoism, Buddhism, Islam, Catholicism and Protestantism.