The invention relates to a mouse corrector, which comprises corrector and positioning ruler. Wherein, the corrector comprises base support, band ring, left and right pads, upper protective pad and positioning ruler support; the band ring is at the front of base support whose two ends are fixed on the base support; the band ring is formed by two half rings to be connected by muffle to extend; the left and right pads are mounted at left and right of base support, with adjustable left and right positions, to form clamping with the front protective pad; the positioning ruler support is fixed between left and right pads at the back of base support; the positioning ruler comprises connecting bridge, lower cross standard ruler, upper cross ruler, lower compressing bar, upper compressing bar; the connecting bridge is between lower cross standard ruler and upper cross ruler, to be fixed with lower and upper compressing bars; the front of connecting bridge has insert plate inserted into the positioning ruler support; the lower cross standard ruler has cross scale line; the upper cross ruler has cross line without scale; the connecting bridge, lower cross standard ruler and upper cross ruler are made from transparent materials. |