The invention discloses a preparation technology applied to produce a soft-shell 
lithium battery. The preparation method comprises: 1) preparing 
cathode and 
anode formula materials; 2) performing material mixing and 
slurry dragging for 
cathode and 
anode, concretely, a) performing 
cathode material mixing and 
slurry dragging, and b) performing 
anode material mixing and 
slurry dragging, further concretely, in the a), performing pretreatment on cathode ingredients, performing ball milling on the cathode ingredients, preparing a slurry from the cathode ingredients, and performing slurry dragging operation on the cathode ingredients, and in the b), performing pretreatment on anode ingredients, performing ball milling on anode ingredients, preparing a slurry from anode ingredients, and performing slurry dragging operation on anode ingredients; preparing the battery, concretely, preparing a cathode sheet from the cathode ingredients subjected to slurry dragging, preparing an anode sheet from the anode ingredients, overlaying the cathode sheet and the anode sheet according to the internal structure of the 
lithium battery, and then performing packaging by utilizing an 
aluminium-plastic membrane or an 
aluminium-plastic 
composite membrane as a shell, and then winding an electric-leakage protective layer around the polar ends and the shell of the 
lithium battery. The 
lithium battery manufactured by employing the new technological process is capable of effectively avoiding electric leakage phenomenon caused by heating, thereby avoiding similar accidents during usage, and the whole technological process is scientific, reasonable and high in handleability, and can be easily implanted into industrial 
assembly line operation.