The invention provides a high-pressure washing robot device. The high-pressure washing robot device comprises a multistage drive mechanism and a spraying mechanism, wherein a front-stage drive mechanism comprises a first drive motor and a first rotary mechanical arm, the first drive motor drives the first rotary mechanical arm to rotate through a rotary joint, a circuit channel is arranged insidethe first rotary mechanical arm, a high-pressure hose which is used for connecting the spraying mechanism is arranged in the circuit channel, the rotary joint comprises a fixed outer ring and a rotaryinner core arranged inside the fixed outer ring, the rotary inner core comprises drive shaft connecting parts at the two ends, a mechanical arm connecting part and a winding central part on the middle part, a circuit inlet is formed in a position, which corresponds to a wire winding space, of the side wall of the fixed ring, a circuit through hole for enabling the wire winding space to communicate with the circuit channel is formed in the mechanical arm connecting part, and the high-pressure hose gets across a wire winding central shaft and then passes through from the circuit through hole. The high-pressure washing robot device has the advantages that the structure is novel, the hose is not liable to wear, the service life is long, and maintenance cost is low.