Non-contact type three-coordinate measuring instrument accuracy detection device

The utility model discloses a non-contact type three-coordinate measuring instrument accuracy detection device. The device comprises a middle gradienter seat and detection mechanisms arranged at two end of the middle gradienter seat, each detection mechanism includes an L-shaped support plate, a mounting seat, a locating body and a dial indicator connecting seat; the mounting seat includes a gradienter mounting seat, a Y-direction dial indicator contact plate and an X-direction dial indicator contact plate, the outside of the bottom of the gradienter mounting seat is provided with a first locating pin, the Y-direction dial indicator contact plate is arranged at the inner side of the gradienter mounting seat, and the X-direction dial indicator contact plate is arranged inside a mounting groove of the Y-direction dial indicator contact plate; the locating body includes a second locating pin, a handle and a retaining ring, and the lower end of the second locating pin penetrates through a guide sleeve, the X-dire