Computer mainboard fixing device for computer

The computer mainboard fixing device for the computer comprises a machine bin, a bracket is welded to the inner wall of the back face of the machine bin, a plate body is installed on the surface of the front end of the bracket, a rotating block is welded to the right side of the middle of the bracket, a first rotating hole is formed in the rotating block, and a first rotating rod is inserted into the first rotating hole; rod frames are welded to the ends, away from each other, of the two extending rods, rod bins are formed in the left sides of the rod frames, movable rods are inserted into the rod bins, inserting sticks are inserted into the first inserting grooves, and the inserting sticks penetrate through the first inserting grooves to extend into the rod bins. The practicability of the device is improved, operation is convenient, the situation that the assembly difficulty is increased due to the fact that the plate body inclines during fixing is avoided, the applicability of the device is improved, the de