Washing device for internal combustion engine

The utility model provides a washing device for an internal combustion engine, which comprises a vessel, a gas inlet portion and an outlet portion, wherein the gas inlet portion and the outlet portion are connected with the vessel in an inserted manner. A chamber for holding washing agent is arranged inside the vessel, the gas inlet portion is connected with a gas storage assembly of pressurizing washing agent in a guided manner, a guide tube extending into the chamber is arranged on the outlet portion, the guide pipe is capable of guiding the washing agent into a gas inlet pipe of an internal combustion engine, additionally, a gas inlet connector can be linked with a gas outlet needle which is used for outputting air stored in the gas storage assembly, and the guide pipe is provided with an insertion portion for the gas outlet needle to insert into. By adopting the gas outlet needle, the washing device has the advantages of stably injecting air into the guide pipe.