Workpiece size precision detection equipment

The invention relates to the technical field of size detection equipment, and discloses machined part size precision detection equipment which comprises a supporting mechanism, the supporting mechanism is of a hollow box-shaped structure, a driving part is fixedly installed on the inner wall of the supporting mechanism, and the output end of the driving part penetrates through the supporting mechanism; and the fixed end of the detection mechanism and the supporting mechanism are fixedly installed. According to the machined part size precision detection equipment, the stop electromagnet is electrified and magnetized through the trigger mechanism and then is matched with the magnet for limiting, meanwhile, the driving part is connected with the bearing part through the damping bearing, the bearing part overcomes friction force and does not rotate any more, and the first magnetic clamp and the second magnetic clamp still keep rotating through the transmission mechanism; the detection mechanism is matched to dete