The invention provides a quick correction method of an image measurement instrument. The quick correction method comprises the steps of horizontally or vertically placing a standard line scale on a worktable, adjusting a lens of the image measurement instrument so that a focal length is clear, adjusting so that one scale mark in the standard line scale is in the field of vision of the image measurement instrument and recording the corresponding coordinates of the scale mark in an imaging window by use of the image measurement instrument, further adjusting so that another scale mark in the standard line scale is in the field of vision of the image measurement instrument and recording the corresponding coordinates of the scale mark in the imaging window by use of the image measurement instrument, calculating the corresponding length H of the image measurement instrument according to the coordinates measured twice, next, obtaining a linear compensation coefficient a of the image measurement instrument according to the relationship of the actual scale L of the standard line scale to the length H, a=L/H, and correcting any one point in the image measurement instrument according to the linear compensation coefficient, thereby obtaining the corresponding corrected coordinates. The method is capable of correcting the image measurement instrument simply and quickly.