Depth detection device for different steps in deep hole in narrow space

The invention discloses a depth detection device suitable for different steps in a deep hole in a narrow space. The detection device comprises a Y-shaped bracket, a display unit, a mobile power supply, a measuring grip, a quick pressing plate, a guide block, a reinforcing bracket, a calibration block, a bottom plate supporting cushion block, a calibration bottom plate, a tail end bracket, a sensor, a sensor clamping block, a carbon fiber guide rail, a bracket, a tail end chuck and the like. According to the depth testing tool, a comparison method is adopted for measurement, and a calibrated measuring base is used for calibration, so that a measured value is reproduced on a measuring rod. During use, the measuring grip is held by a hand, the measuring support is clamped at the rear end of a workpiece, the sensor touches a corresponding plane, and the position size of the deep hole can be detected. Depth detection between different steps in a deep hole in a narrow space can be realized, the problem that the dep