A pellet grill includes a grill body, a burning chamber and a wire grid arranged in the grill body. The wire grid is arranged above the burning chamber. A pellet inlet is formed in a lateral portion of the grill body. A fire-proof partition plate is arranged between the wire grid and the burning chamber and partitions the grill body into an upper cavity and a lower cavity. The burning chamber is arranged in the lower cavity. The wire grid is arranged above the upper cavity. A fire-pervious window is arranged on the fire-proof partition plate and is located above the burning chamber. An opening and closing device for controlling the fire-pervious window to be opened to realize higher temperature or closed to realize lower temperature is arranged on the fire-pervious window. An ash removal mechanism for removing ash accumulated in the burning chamber is arranged on the grill body.