The invention discloses an automatic clutch reciprocating motion pumping unit, which is a pumping unit in the technical field of pumping units used for oilfield production. The automatic clutch reciprocating motion pumping unit consists of a rack body, a belt pulley, a drive shaft, a bearing, a bearing seat, a bearing seat bolt, a rotary longitudinal gear, a spring, a sliding column, a column top ball, a sliding longitudinal gear, a pressure-bearing steel ball, a left pressure ring, a clutch handle, a right pressure ring, a seat ring, a positioning nut, a dust-proof sleeve, a reciprocating rope, a connecting plate, a well rod, an in-plate top fastening bolt, a plate-end top fastening bolt, a hanging rope, lifting lugs, a supporting roller shaft, a supporting roller, a weight box, weight iron, a supporting handle shaft, a supporting handle plate, a handle end shaft, a leaving plate, a moveable steel rope and a plumb bob body. A drive mechanism of the invention balances 0.99 time of the gravity of the well rod and the gravity of the weight box, takes 0.01 time of the gravity of the well rod as the gravity for the downward movement of the well rod, so that consumed energy of a motor is only 0.01 time of the weight of the well rod and the lifting weight and the friction force of crude oil. Therefore, 25 to 30 percent of energy can be saved and 80 percent of cost can be saved.