The invention discloses a valve rod automatic checkout device, and belongs to valve rod checkout devices. The valve rod automatic checkout device saves labor, and is efficient and accurate in data. The valve rod automatic checkout device comprises a feeding mechanism, a conveying mechanism, a measurement mechanism, a positioning mechanism and the like; the feeding mechanism is formed by a retainer plate, a splitting air cylinder and a stopping gate plate; the conveying mechanism is formed by a longitudinal guide rail, a longitudinal sliding plate, a first transverse guide rail, a first transverse sliding block, a first lifting air cylinder, a first conveying plate, a second conveying plate, a second positioning plate, a first transverse air cylinder and a first positioning plate; the measurement mechanism is formed by a second transverse guide rail, a second transverse air cylinder, a second lifting air cylinder, a first vertical sliding block, a first motor, a pressing rod shaft, a positioning measuring head and a supporting block; the positioning mechanism is a pneumatic ejection rod. By means of the valve rod automatic checkout device, the labor intensity is reduced, the detection efficiency is improved, the size does not need to be manually marked, and the measurement accuracy is improved.