The present invention is provided with a lock fixing mechanism with quick assembly and disassembly, with a position lock block coupled to a position lock bar, the position lock block is contacted with the side surface of the position lock bar, by rotating, the position lock block squeezes the position lock bar. Under the action of the pressure, the spring connected to the position lock block deforms that the position lock bar moves towards the deforming direction of the spring, therefore the position lock bar is locked between the position lock block. The entire device doesn't need additional components nor need professional to operate that it has well applicability. The present invention further provides with a booth applied with the lock fixing mechanism with quick assembly and disassembly.