Large-air-volume split type catalytic combustion device

The utility model discloses a large-air-volume split type catalytic combustion device which comprises an upper box body, a connection catalysis mechanism and a limiting mechanism, the connection catalysis mechanism is arranged on the upper box body, the limiting mechanism is arranged on the upper box body, and the connection catalysis mechanism comprises a lower box body, a catalysis plate and a heat exchanger. The lower box body is arranged at the bottom of the upper box body, an air inlet fan is installed on the left side of the lower box body, and an air inlet pipe communicating with the air inlet fan is installed at the top of the air inlet fan. Through mutual cooperation of the mounting block, the stop block, the fixed flange, the limiting groove, the limiting block, the connecting block, the pull block, the lifting block, the positioning rod, the buffer spring, the fixed groove, the movable plate, the clamping block, the clamping groove and the movable block, the catalytic plate can be conveniently disa