Environmental engineering wastewater treatment device and treatment method thereof

The invention discloses an environmental engineering wastewater treatment device. The device comprises a sewage treatment tank; the sludge conveying pump is fixedly connected with the top of the inner wall of the sewage treatment tank; the input end of the sludge conveying pump is fixedly connected with the upper end of the sludge inlet pipe, and the lower end of the sludge inlet pipe extends to the bottom of the sewage treatment tank; one end of the sludge discharge pipe is fixedly connected with the output end of the sludge conveying pump, and the other end of the sludge discharge pipe extends out of the sewage treatment tank; the sludge treatment control mechanism is mounted in the sewage treatment tank; when more sludge is accumulated at the bottom in the sewage treatment tank, the sludge submerges the bottom of the air outlet outer pipe, so that the air outlet outer pipe is unsmooth in exhausting, the air pressure in the air outlet outer pipe is increased to jack the piston and the sliding sleeve, the se