A building dust collection device for building construction, including an exhaust fan, a ventilation hopper, a hose, an air outlet pipe, a wave pusher, a water tank, a collection box, a partition, a filter screen, a water pump, a box body and a control panel; the exhaust fan is set On the top of the box, there is an air inlet channel connected to the exhaust fan on the box body. The air inlet channel, ventilation hopper, hose and air outlet pipe are connected in sequence. The air outlet pipe faces the inside of the water tank. There is a drive mechanism for driving the air outlet pipe to vibrate up and down and driving the wave pusher to reciprocate laterally. The water tank is set on the top of the collection box, the collection box is set inside the box body, the partition is set on the collection box, and the filter screen is set on the partition. And on the collection box, and the filter screen is located under the horizontal side of the water tank, the water pump is arranged on the box body, the pumping end of the water pump is connected with the collection box, and the water discharge end of the water pump is located above the water tank. The invention can effectively absorb the dust, filter the generated dirt, and prolong the usable time of the device.