Independent floating auxiliary positioning clamp for piston

The utility model provides an independent floating auxiliary positioning fixture for a piston, which can solve the technical problem of low positioning accuracy of the traditional fixture. An independent floating auxiliary positioning clamp for a piston comprises a tensioning pin, a tensioning body and a spigot seat, and is characterized in that the spigot seat is provided with a pair of spigot profiling positioning blocks matched with spigots on the two sides of the piston, and the clamp further comprises floating positioning blocks in one-to-one correspondence with pin seat planes of the piston; the floating positioning block is arranged between a pair of spigot profiling positioning blocks of the spigot seat, the floating positioning block and the spigot seat are in guide fit through a pair of bolts, screw rods of the bolts penetrate through guide holes of the floating positioning block and then are fixedly connected with the base plate, the screw rods are sleeved with springs, and the two ends of the spri