The invention discloses an indirect hot blast stove. The indirect hot blast stove comprises an air bellow, a hot box, a heat exchanger, a combustion furnace, a feeding device and a tail gas treatmentdevice; a downward air blower is arranged in the air bellow; the tail gas treatment device comprises a first exhaust fan, a first connecting pipe, a second exhaust fan and a cyclone dust collector; the size and power of the first exhaust fan are both larger than the size and power of the second exhaust fan; the first exhaust fan and the second exhaust fan are both provided with power-on switches;the heat exchanger comprises heat radiating boxes and heat radiating pipes, the heat radiating pipe is a U-shaped pipe, adjacent heat radiating boxes are communicated through the plurality of heat radiating pipes, and the outermost two heat radiating boxes are communicated with a smoke exhaust pipe and a tail box respectively; the heat radiating boxes are all provided with ash removal openings atone ends; the combustion furnace comprises a combustion chamber and an ash channel; a transverse partition plate is arranged in the inner cavity of the combustion chamber, and the top end of the transverse partition plate is lower than or flush with the bottom end of the furnace tail opening; an oxygen inlet hole is arranged on the combustion chamber bottom wall between the transverse partition plate and the furnace tail opening; and the bottom wall of the ash channel is an inclined bottom wall inclined downwards towards the ash channel opening.