The invention provides a 
discharge method of a waste 
lithium battery. The 
discharge method comprises the following steps of: firstly, directly contacting a waste 
lithium battery with a sacrificial 
anode to obtain a pretreatment 
system, immersing the pretreatment 
system in a conductive 
salt solution for 
discharge, and finally, leading out the positive 
electrode and the negative 
electrode of the battery, respectively connecting the positive 
electrode and the negative electrode with 
copper sheets, putting the 
copper sheets into the conductive 
salt solution, measuring the 
voltage of the battery until the 
voltage value tends to be stable, and ending discharge. The sacrificial 
anode can stably exist in a neutral or alkaline solution, the influence of illumination, temperature and the like is small, and the discharge condition is easy to control; the sacrificial 
anode is preferentially oxidized and dissolved in the discharge process to prevent 
chlorine from being separated out, so that the problem of 
electrolyte leakage 
pollution is effectively solved; moreover, as the sacrificial anode corresponds to the positive ions of the conducting salt, the 
ion concentration of the conductive 
salt solution is increased after the sacrificial anode is dissolved, the cyclic utilization of the conductive salt solution can be realized while the 
discharge rate is increased, and the discharge cost is saved. The method is simple in process, easy to operate and suitable for large-scale application.