The invention discloses a broad roller kiln for a burnt porcelain brick, which comprises a kiln furnace burning nozzle and a burning assistant (or atomizing) blower. The kiln furnace burning nozzle is divided into a remote burning nozzle with reducing tube gradient and a near burning nozzle with increasing tube gradient; the burning assistant (or atomizing) blower is divided into a remote burning assistant (or atomizing) blower and a near burning assistant (or atomizing) blower; the burning nozzle brick of the kiln furnace burning nozzle has different gradient cone heights; the remote burning nozzle with different gradient cone heights and the reducing tube gradient is matched with the near burning nozzle with increasing tube gradient for use; and the kiln furnace burning nozzle brick has different inlet and outlet diameters, and the furnace kiln burning nozzles with different inlet and outlet diameters are matched with each other for use. Through the match of the adjustment means, a plurality of spraying coverage can be obtained within the cross section of the kiln furnace, so that kiln furnace has the capacity of isothermal control of the cross sections.