Horizontal atmosphere transverse water pipe boiler

The utility model relates to a horizontal atmosphere transverse water pipe boiler which is provided with a base, a water leg boiler shell whose front, back, left, right and top end are communicated, and a lower collecting box pipe. The top wall and the back wall of a boiler chamber are provided with water legs which are communicated with the water legs on the left and the right of the boiler shell. An irradiating water pipe is arranged above the boiler chamber. The back wall of the boiler chamber is provided with a smoke outlet. A smoke channel which is communicated with the smoke outlet is arranged between the back wall of the boiler chamber and the water leg on the back of the boiler shell. A dust removing and ash blocking opening which is opposite to the smoke outlet is arranged in the smoke channel. A smoke channel which is communicated with the smoke channel is arranged between the top wall of the boiler chamber and the water leg on the top end of the boiler shell. Convection water pipes are arranged in the two smoke channels. The utility model has the advantages of simple structure, high heat efficiency, and good dust removing effect.