The invention discloses a comprehensive recovery method of waste rare earth batteries. The recovery method comprises the following steps that A, outer shells of the batteries are removed, and the batteries completely discharge; B, the waste rare-earth batteries are subjected to crushing treatment, and positive poles, negative poles, diaphragms, battery cores and steel shells are separated out; andC, the diaphragms are put into a sulfuric acid solution with the concentration of 2 mol/L to 6 mol/L according to the proportion that 1 kg of the diaphragms are put into 2 L to 3 L of the sulfuric acid solution, further a reaction is carried out for 0.5-2 hours, and then filtering is carried out to obtain the diaphragms and a filtrate. According to the comprehensive recovery method of the waste rare earth batteries, crude copper, crude nickel and other valuable substances are separated from positive and negative pole pieces through a physical method, furthermore, classification recovery of battery parts and battery materials is realized, separation and reutilization of rare earth and cobalt are realized, meanwhile, the using amount of chemical reaction reagents is reduced in the whole process, the reaction time is shortened, energy consumption is reduced, the technology is simple, the recovery rate is high, a foundation is established for the dynamic storage of rare resources such asthe rare earth and the nickel, and furthermore, the method is low in cost and obvious in economic benefit.