The invention discloses a tab short-circuit-proof method of a soft package lithium battery. The tab short-circuit-proof method comprises the following steps: step 101, carrying out positive electrode tab treatment: selecting tab glue, wherein the tab glue is one of black glue, white glue or yellow glue; firstly, forming an insulating layer on the surface of a positive electrode tab base body by utilizing a natural color anodic oxidization, black anodic oxidization or micro-arc oxidization method, wherein the thickness of the insulating layer is no smaller than 10 microns; measuring surface insulating resistance by a 500V insulating resistance meter, wherein the surface insulating resistance needs to be more than 200 megohms; then casting the tab glue on the positive electrode tab base body in a curtain coating way; cutting a positive electrode tab to a required size; finally, carrying out oxidation layer removal treatment on two ends of the tab by utilizing a chemical method; step 102, assembling a single battery: specifically, firstly, welding the tab; then packaging the battery; vacuumizing and sealing, and standing for more than 24h; observing whether leakage exists or not; cutting apart a single battery side plate, injecting liquid, aging and standing; finally, vacuumizing and carrying out secondary package on the single battery in a final state.