The invention relates to a checker, in particular to a color blind checker. Therefore, the technical problem of the present invention is to provide a color blindness checker that can conveniently and effectively check color blindness. The technical embodiment of the present invention is: a color blindness checker, including a first circular base, a fixed plate, a splint, a first arc spring, a hollow plate, a first bracket, a chuck, a disc, a color plate, Arc-shaped slide bar, second arc-shaped spring, etc.; the top of the first circular base is connected with a fixed plate, and the left and right parts of the fixed plate are connected with splints in a rotating manner. In the first groove, a first arc spring is connected between the inner sides of the two first grooves. In the present invention, inspectors hold the first handle and swing it downwards so as to change the color and merge with the hollow letter boards. In this way, the inspection personnel can replace the hollow letter boards with different characters for inspection, and the inspectors can move the third sliding sleeve forward or backward so that people can see The hollow word board received is blurred or clear.