Horizontal flue ash removal system of boiler and boiler

The utility model relates to a horizontal flue ash removal system of a boiler and the boiler, the horizontal flue ash removal system of the boiler comprises an ash falling device, an ash blowing pipe and an air blowing device, the ash falling device comprises an ash falling pipe, and the ash falling pipe is used for being communicated with the bottom of the horizontal flue; the dust falling pipe is arranged below the horizontal flue, so that dust in the horizontal flue can be introduced into the dust falling pipe from the horizontal flue by virtue of gravity, the dust falling pipe is communicated with the dust blowing pipe, and the dust blowing pipe is arranged below the dust falling pipe, so that dust in the dust falling pipe can be introduced into the dust blowing pipe from the dust falling pipe. Besides, the soot blowing pipe is communicated with the air blowing device and used for blowing the dust in the soot blowing pipe out of the soot blowing pipe, so that the dust in the horizontal flue of the boiler