Caliper tool for laying underwater precast blocks

A caliper tool for laying underwater precast blocks relates to the technical field and structurally comprises two caliper rods, two fixing heads, two caliper heads, two fixing bolts and two auxiliary rods, the fixing heads are arranged at the front ends of the caliper rods, the caliper heads are arranged at the front ends of the fixing heads, the two fixing heads are connected through the fixing bolts in a crossed mode, and the auxiliary rods are connected through the auxiliary rods. The forceps head is in an inward hook shape; a ring A and a ring B are arranged at the two ends of the auxiliary rod respectively, and the plane of the ring A and the plane of the ring B are perpendicular to each other. The utility model has the beneficial effects that the labor consumption of manually lifting and transporting precast blocks can be greatly reduced, the construction efficiency is improved, the construction quality is ensured, and the construction progress is accelerated; the prefabricated block can be firmly clamp