The invention discloses a positioning tool for an automobile mold. The positioning tool comprises a base, a fixed seat, a connecting seat and a sliding seat; the lower end of the fixed seat is fixedlywelded to the seat, a clamping piece and an adsorption fixed piece are slidably installed in the fixed seat, two pressing pieces are installed at the upper end of the fixed seat; the connecting seatis fixedly welded on one side of the fixed seat, and two sides of the connecting seat are rotationally provided with hydraulic pushers respectively; and the sliding seat is connected with the connecting seat through the hydraulic pushers, and the lower end of the sliding seat is slidably arranged on the seat. The positioning tool has the advantages that operation is simple and convenient, mold parts with irregular shapes such as an automobile top cover and an instrument panel in the automobile mold can be fixed in an all-dimensional mode, so that operation of machining, maintaining and the like of the automobile mold is very convenient; and meanwhile, design is reasonable, so that the problem of secondary damage of the automobile mold caused by rigidity fixing is effectively solved, and the phenomena of damage or paint falling of the automobile mold caused by collision in the machining and maintenance processes are avoided, processing efficiency and processing convenience are improved,and good use and popularization values are achieved.