Piston angle test tool

The invention discloses a piston angle test tool, used for adjusting an included angle in a pit of a piston. The piston angle test tool comprises a substrate, a flexible test plate and a driving mechanism; a slot is formed in the substrate; the outer edge of the flexible test plate is abutted against the slot wall of the slot; the driving mechanism is used for driving the flexible test plate to expand or shrink, so that the outer edge of the flexible test plate slide back and forth along the slot wall of the slot. The slot is formed in the substrate for simulating the pit on the top of the piston, the flexible test plate is used for simulating the angle of the sharp corner of the pit, and the driving mechanism is used for driving the flexible test plate to expand or shrink to simulate thedifferent pit sharp corners, so that under the scheme of the existing oil sprayer nozzle oil pocket taper angle, the pit sharp corner under the best state is expressed by verifying the dynamic property, economy and discharge,