Negative pressure dust removal device for weak current construction

The utility model discloses a negative pressure dust removal device for weak current construction, which belongs to the field of machinery and structurally comprises a complete machine shell, a negative pressure adjusting cylinder, a frequency conversion regulator, an air draft valve port and a fan box body, the negative pressure adjusting cylinder is mounted on the rear side of the air draft valve port and is communicated with the air draft valve port, and the fan box body is mounted on the right side of the air draft valve port. The negative pressure adjusting cylinder is matched with the air draft valve port, the counter weight sliding block is conducted through the negative pressure cylinder groove to wrap the passageway air bag to lift and slide to form negative pressure buffering operation, and the counter weight sliding block adjusts the air pressure to form the air draft valve port to compress, and an air inlet and outlet connecting pipe is matched with different air pressures to suck and exhaust air