A semi-sealed discharging device for batched recovery of waste and used lithium ion batteries includes: a semi-sealed discharging container filled with a discharging solution, a battery feeding apparatus, a discharge transmission apparatus, a tail gas treatment apparatus, and a battery recovery groove. The lithium ion batteries are fed into a battery storage bin, and then enter the discharging container through a star-shaped material adding device. The batteries then fall into the discharging solution, of which the molar ratio of ferrous sulfate to manganese sulfate is 2:1, to start discharge; after discharging for 14 h, the batteries are floated to the liquid level of the solution along with a conveyor belt and enter a drainage zone; in the draining zone, the solution on the surfaces of the batteries flows away from the holes in the conveyor belt, air generated from an air collecting cover accelerating the draining process; the drained batteries then move to the end of the conveyor belt and fall into the battery recovery groove, wherein the air in the container flows into and is collected in the air collecting cover through an air inlet, so that potential volatile gas are adsorbed through an adsorption chamber and the air is discharged by means of a centrifugal fan. The device is easy to use, is safe and high-effective, is low in cost and is green and environment-friendly.