The invention relates to a detector, in particular to a color-blind detector. The technical problem of the present invention is to provide a color-blindness detector that can attract children's attention and prevent errors. The technical solution of the present invention is: a color blind detector, including a base, a mounting column, a pole, an arc frame, a pointer, a ring frame, a square block, a connecting block, a runner, a first spring, a friction bar, and a slider , slide rails, etc.; the top of the base is connected with a mounting column, and the upper part between the left and right walls of the mounting column is connected with a support rod, and a runner is installed in the middle of the front side of the rod, and four connecting blocks are evenly spaced on the outer side of the runner. , the outer sides of the four connecting blocks are connected with ring frames. In the present invention, the medical staff rotates the ring frame to make the pointer point to the square block of the required color, and can detect the color blindness of children; the position of the square block can be fixed by the friction rod, preventing the square block from rotating freely due to external force, and can ensure the accuracy of the detection result. accuracy.