High-precision angle detection jig

The invention relates to a high-precision angle detection jig, and relates to the technical field of mechanical measurement, the high-precision angle detection jig comprises a fixed clamping rod and a rotating rod rotatably connected with the fixed clamping rod, the rotating rod is fixedly provided with a rotating gear, the fixed clamping rod is internally provided with a transmission rack engaged with the rotating gear, and the transmission rack is fixedly connected with the rotating gear. A hydraulic measuring mechanism is arranged in the fixed clamping rod and comprises a sliding rod, a sliding channel formed in the fixed clamping rod and a vertical channel communicated with the sliding channel, and the end of the sliding rod is arranged in the sliding channel in a sealed sliding and penetrating mode. The flow sectional area of the vertical channel is smaller than that of the sliding channel, the vertical channel and the sliding channel are used for loading display liquid, liquid level scale marks are arra