Guiding type mixer of low-concentration gas engine

The utility model discloses a guiding type mixer of a low-concentration gas engine, which comprises a three-way shell, a reducing inner sleeve, a bolt assembly and a fastening bolt, the lower surface of the three-way shell is provided with a gas inlet, the right side surface of the three-way shell is provided with an air inlet, and the left side surface of the three-way shell is provided with a discharge port. According to the utility model, the reducing inner sleeve is arranged in the three-way shell, so that the hedging of gas inlet and air inlet can be blocked, after gas enters the annular cavity, the annular cavity is filled with the gas around the outer surface of the inner sleeve, and the gas is guided to flow towards the outlet direction along the annular cavity due to the suction force of a supercharger at the discharge port; the gas inlet smoothness of air is improved, the mixing rate of gas and air is increased, the variable-diameter inner sleeve can be fixedly supported through the bolt assembly, a