Test device, system and method for top drive wash pipe assembly test

The invention discloses a test device, system and method for a top drive wash pipe assembly test, and belongs to the technical field of top drive wash pipe assembly tests. The top drive wash pipe assembly comprises an upper sealing unit, a lower sealing unit and a wash pipe body. The test device used for the top drive wash pipe assembly test comprises a wash pipe supporting seat, the wash pipe supporting seat is provided with an installation cavity and a radial sliding part, and the radial sliding part is installed on the wash pipe supporting seat in a radial sliding mode; the test liquid conveying connector is connected to the radial sliding part, a connecting part used for being connected with the upper sealing unit is arranged on the test liquid conveying connector, and a test liquid channel is formed in the connecting part; and the rotary driving device is installed at the lower end of the washing pipe supporting seat, a rotating part is arranged on the rotary driving device, and the rotating part is used