The invention discloses a PCB board fixing device, comprising a PCB groove, a bracket, a cross bar, a bearing, an insulating protection layer, a fixing plate, a first chute, a base, a spring, a convex column, a groove, a PCB board, and a slider , the second chute, steel ball and electric hole. The beneficial effects of the present invention are: the inner edge of the PCB groove of the present invention is provided with several convex posts, the springs are embedded inside the convex posts, and the convex posts are engaged with the grooves on the surface of the PCB board, so that the PCB board is fixed in the PCB groove , and ensure that the PCB board is not broken, the first chute is set on the front of the fixed plate, and the second chute is set on the back, and both the first chute and the second chute can be slidably connected with the slider on the surface of the insulating protective layer, The front and back of the PCB board can be exchanged by rotating the bearing, so that both the first chute and the second chute can be slidably connected with the slider, which effectively solves the problem that the back is not easy to work. The structure is compact, and the work on both sides can be solved on the front. Strong, good economic and social benefits, conducive to popularization.