The invention discloses a washing device. The washing device comprises a gun body, a first high-temperature steam
pipe, a valve device and an extraction liquid
pipe, wherein the gun body comprises a stock and
gun barrel segments communicated with the stock, the
gun barrel segments include the first
gun barrel segment, the second gun
barrel segment and the third gun
barrel segment, one end of the first gun
barrel segment is communicated with one end of the stock, the other end of the first gun barrel segment is communicated with one end of the second gun barrel segment through a
universal joint with a hollow cavity, the second gun barrel segment is sleeved with the third gun barrel segment, one end of the third gun barrel segment is connected with the
universal joint, an annular space is formed by the end of the third gun barrel segment and the
universal joint, and the other end of the third gun barrel segment extends to the front side of the other end of the second gun barrel segment to form a
diffusion space; the first high-temperature steam
pipe is arranged in the gun body, one end of the first high-temperature steam pipe is communicated with one end of the universal joint, and the other end of the first high-temperature steam pipe extends out of the other end of the stock to be communicated with a high-temperature high-pressure
steam generation device; the valve device is arranged between the stock and the first gun barrel segment and used for connecting and disconnecting the first high-temperature steam pipe; the extraction liquid pipe enters the first gun barrel segment and is communicated with the first high-temperature steam pipe and the universal joint.