Error detecting system of minitype high accuracy three coordinate measuring machine

The invention relates to an error detecting system of a minitype high accuracy three-coordinate measuring machine, which is characterized by comprising an X/Y axis target lens, an optical transition target lens, a Z axis target lens, a vertical edge laser interferometer having optical axis being parallel to X axis direction and a transverse edge laser interferometer having optical axis being parallel to Y axis direction. The error detecting system is synchronously tested by multiple items of high accuracy geometrical error, and can realize nanoscale precision detection for the geometrical error of the three-coordinate measuring machine. Furthermore, the error detecting system has high working efficiency and simple operating way.