A housing locking apparatus includes a shell, a cover, a fixing member, a blocking member and an operation member. The shell includes an abutting portion protruding inside of the shell and a restriction member protruding outside of the shell. The cover includes a covering plate and a sidewall protruding from the covering plate. The sidewall defines a restriction hole and abuts against the outside of the shell. The restriction member is movably received in the restriction hole. The fixing member is attached to the covering plate. The blocking member and the operation member are both rotationally attached to the fixing member. An end of the blocking member abuts against the abutting portion. The operation member rotates around the fixing member at a first direction to press the blocking member to rotate to position the end of the blocking member between the covering plate and the abutting portion.