Water-cooling mold positioning device

The utility model relates to the technical field of preform cooling devices, in particular to a water-cooling mold positioning device which comprises an upper positioning block and a lower positioning block, and an upper fixing structure used for being fixed with a water-cooling mold is arranged on the upper positioning block. The lower positioning block is provided with a lower fixing structure used for being fixed to a water-cooling mold mounting frame of the water-cooling setting machine, the upper positioning block and the lower positioning block are provided with a positioning protrusion and a positioning hole respectively, and the positioning protrusion comprises a root portion and a tail end in the protruding direction of the positioning protrusion. The sectional area, in the direction perpendicular to the protrusion, of the tail end is smaller than the sectional area, in the direction perpendicular to the protrusion, of the root portion so that a guiding face can be formed between the tail end and the