Positioning tool for watertight measurement of low-pressure casting part

The utility model discloses a positioning tool for watertight measurement of a low-pressure casting part, and belongs to the field of positioning tools. A positioning tool for watertight measurement of a low-pressure casting part comprises a bottom plate; the guide seat is fixedly connected with the bottom plate and provided with a first sliding groove extending in the radial direction; the positioning block is in sliding connection with the guide seat, and first sliding blocks moving along the first sliding grooves are arranged at the two ends of the positioning block; two ends of the spring are fixedly connected with the guide seat and the positioning block respectively; the positioning column is fixedly inserted into the low-pressure casting part; the guide block is fixedly connected with the guide seat; the transmission ring is in sliding connection with the guide block; the push block is fixedly connected with the transmission block; a second sliding groove extending in the axis direction is formed in th