Premixing device for fully premixing combustion

The utility model discloses a premixing device for fully premixing combustion, which comprises a fan and a cover shell, wherein the fan is arranged in a premixing cavity which is formed by the cover shell; an air inlet and a gas inlet which is connected with a gas pipeline are arranged on the cover shell; the cover shell comprises a guide cover and a lower shell; the guide cover comprises a guide cylinder and a connecting cover; and the air inlet and the gas inlet are arranged on the guide cylinder. The premixing device can premix air and gas fully; the structure is simple and the size is small.