The invention discloses a combustor of a premixed gas stove, which comprises a fire cover, a fan and a combustor main body and is mainly characterized by also comprising a mixed baffle, a gas collecting hood and a distributing plate. The combustor main body is provided with a gas channel, an air channel and a partition board, wherein the gas collecting hood is arranged on the partition board of the combustor main body. The mixed baffle is arranged above the gas collecting hood and an air outlet in the air channel is communicated with a gas outlet in the gas channel. The distributing plate provided with gas distributing holes is arranged above the mixed baffle in the combustor main body. The invention has the characteristics of effectively and uniformly mixing gas with air, enabling the gas to be fully combusted, reducing the generation of CO, ensuring that excess air in the combusted flue gas is less, reducing the heat taken away by the flue gas and the like.