I'm in dubai, 4months now. My salary always late,...

We would like to inform you that if you have terminated the contract because the employer did not pay your salary, this is considered a justification for ending the contract and it does not result in a ban because the employer violated the contract. Therefore you should notify the Labor Office by filing a complaint against the employer at the Labor Office via the following link:

Complain
Moreover, you can check the below articles from the labor law:

Article (116):

Where a contract is revoked by the worker for reasons other than those specified in Article (121), he shall be required to compensate the employer for any damage the latter sustains as a result, provided that the amount of compensation shall not exceed half a month wage for three months or for the remaining period of the contract, whichever is shorter, unless otherwise stipulated in the contract.

Article (121):

 A worker may leave work without notice in one of the following cases:

1-    If the employer violates his obligations before the worker in the articles stipulated in the contract or the law.

2-    If the employer or his legal representative signs an assault on the worker.