The invention belongs to the field of battery manufacturing, and relates to a method for preparing a thin thermal battery negative electrode pole piece based on a slurry coating method. The method comprises the following steps: mixing a thermal battery negative electrode powder material, an adhesive and an organic dispersing agent so as to form uniform slurry, coating the slurry on a conductive substrate, molding, drying, and curing, thereby obtaining the thin thermal battery negative electrode pole piece. Compared with a conventional powder tabletting forming process, the method is relatively low in cost, simple in process and applicable to large-scale industrial product, is innovative in the small-size/thinning field of thermal batteries, and has very high values for promoting development of the national defense industry, the thickness of the thin thermal battery negative electrode pole piece prepared by using the method can be reduced by 1/3-1/2, and the thickness of the thin thermal battery negative electrode pole piece can be adjusted within dozens of to hundreds of micrometers.