Rockwell hardness tester convenient for adjusting test platform

The utility model discloses a Rockwell hardness tester convenient to adjust a test platform, which comprises a Rockwell hardness tester body, the Rockwell hardness tester body comprises a base, a rack, a cross arm and a test platform lifting mechanism, the upper surface of the base is provided with a position adjusting mechanism, the position adjusting mechanism comprises a movable plate, and the movable plate is arranged on the rack. The test platform lifting mechanism is arranged on the upper surface of the movable plate, the top end of the test platform lifting mechanism is fixedly connected with a supporting platform, and the outer surface of the supporting platform is sleeved with a fixing assembly used for fixing an irregular object. When the hardness testing device is used for testing the hardness of an irregular object, the object to be tested is firstly placed on the upper surface of the supporting platform and then sleeved with the fixing ring, the position of the arc-shaped block is adjusted throug