Ultra-precision plastic lens semi-finished product thickness measuring device

The utility model discloses an ultra-precision plastic lens semi-finished product thickness measuring device comprising a substrate, the center of the front surface of the substrate is bolted with a centering limiting column, the front surface of the substrate is axially and fixedly connected with a coarse positioning limiting mechanism, and the front surface of the substrate is axially and fixedly connected with a material thimble point limiting mechanism. The coarse positioning limiting mechanism is located on the inner side of the material ejector pin point limiting mechanism, and the outer side of the material ejector pin point limiting mechanism is fixedly connected with a to-be-measured object through hole light-transmitting block. Through cooperation of the substrate, the centering limiting column, the coarse positioning limiting mechanism, the material ejector pin point limiting mechanism and the to-be-measured object through hole light-transmitting block, the to-be-measured and analyzed material cann