The invention discloses a brick kiln for firing coal gangue bricks, mainly comprising a fuel gas booster (1), a fuel gas inlet (2), a control system (3), a kiln (4), an exhaust opening (5), a water inlet (6), a water outlet (7), an afterheat collector (8), an air inlet (9), a fan (10), a nozzle (11), a gas valve (12), an air valve (13) and a temperature sensor (14). Through arranging a heat circulation channel in the kiln wall, the coal gangue bricks can be rapidly processed, the energy source is fully utilized and the economic benefit is improved. Through arranging the brick kiln, temperature of the kiln can be accurately controlled, the product quality is improved, and product quality stability is guaranteed; besides, the afterheat can be fully used and the economic benefit is improved.