Checking fixture special for projecting cylinder surface of engine piston

The invention relates to a checking fixture, in particular to a checking fixture special for a projecting cylinder surface of an engine piston. The checking fixture comprises a checking fixture body and two dial gages, wherein the checking fixture body comprises a panel part and a flange; the flange is on the edge of the lower surface of the panel part; the flange and the panel part form a rectangular groove; a handle rod is mounted on the upper surface of the panel part of the checking fixture body; the rectangular groove of the checking fixture body is provided with two through holes which are communicated with the upper surface and the lower surface of the panel part respectively; the two dial gages are mounted in the two through holes through clamp open sleeves respectively and are fixed and regulated by bolts. According to the checking fixture special for the projecting cylinder surface of the engine piston, the error rate of selecting a gasket in the checking process is decreased, the accuracy in measuring an error range of a piston stroke is improved, and the double-surface data of a piston projecting height can be measured and checked quickly and accurately.