Measuring device for abrasion loss of steel rail, calibration table and rail inspection trolley

The utility model discloses a steel rail abrasion loss measuring device which comprises a bearing part and a sensor assembly, the sensor assembly comprises a sensor and a sensor direction adjusting device for installing the sensor, and the sensor direction adjusting device comprises a first assembly, a second assembly and a third assembly which are connected in sequence. The sensor is movably arranged on the third assembly, the first assembly can drive the second assembly to move in the first direction, the second assembly can drive the third assembly to rotate around the second direction, the third assembly can enable the sensor to move in the third direction, and the first direction, the second direction and the third direction intersect in pairs. In conclusion, the sensor direction adjusting device is used for carrying out three-degree-of-freedom position adjustment on the sensor, namely moving in the first direction, rotating around the second direction and moving in the third direction, so that the forme