High-precision gas mixer

The utility model provides a high-precision gas mixer, which belongs to the technical field of gas mixers, and comprises a shell, a gas inlet cavity, a gas inlet pipe, a mixing component and a plurality of gas inlet nozzles, the shell is provided with a main flow channel along the axial direction, the main flow channel comprises a gas inlet end and a gas outlet end, the gas inlet cavity is arranged along the excircle surface of the shell, the gas inlet pipe is arranged in the gas inlet cavity, and the mixing component is arranged in the gas inlet nozzle. The mixing assembly is arranged on one side close to the gas outlet end; a plurality of air inlet nozzles are arranged in the circumferential direction of the shell, the air inlet cavity is communicated with the main flow channel, the air inlet nozzles are bent pipe-shaped, and air outlets of the air inlet nozzles face the center position of the mixing assembly; first gas is introduced into the gas inlet end of the main flow channel, second gas is introduced