Novel square leveling test tool of metal bottom surface

The present invention discloses a novel square leveling test tool of a metal bottom surface. The novel square leveling test tool of the metal bottom surface comprises a pedestal, a leveling platform and fixed devices; the pedestal is made of gray irons, the leveling platform is made of hard alloy steels and has a surface rockwell hardness larger than 52HRC, and the fixed devices are composed of fixed bolts and rotatable fixed clamp strips, wherein the leveling platform is embedded in the pedestal; location holes with internal threads are arranged on the leveling platform, and a measurement steel rule is embedded at the side surfaces of the leveling platform; and the fixed bolts of the fixed devices are capable of fixing the rotatable fixed clamp strips to the location holes. The novel square leveling test tool of a metal bottom surface is able to perform plane rapid detection of the bottom surface of a metal workpiece, and is able to be taken as a leveling reference platform to be applied to a processing center for deep processing of workpieces to be processed.