Positioning device for caliper automatic production line

The invention provides a positioning device for a caliper automatic production line. The positioning device comprises a rack body, a pressing mechanism, a first fine tuning mechanism, a second fine tuning mechanism and a measuring control display amplifying device, wherein the rack body is provided with a front surface which faces towards an operator and a back surface which backs to the operator; a positioning base is arranged on the front surface; a positioning slot is formed in the positioning base; and a caliper is positioned in the positioning slot; the pressing mechanism is assembled on the rack body; and the pressing mechanism is used for pressing the caliper in the positioning slot in a direction from the front surface to the back surface; the first fine tuning mechanism is assembled on the rack body and is used for selectively pushing the caliper to slip and fine tune in a longitudinal direction of the caliper; the second fine turning mechanism is assembled on the rack body, and is used for selective