Integrated sewage treatment device and treatment process for sewage in garbage transfer station

An integrated sewage treatment device and a treatment process for sewage in a garbage transfer station are disclosed, belonging to the technical field of waste treatment. The device and the process are characterized in that the device includes an oil-water-residue separator, an air floatation tank, an intermediate tank, a bioreactor, a sedimentation tank, a sludge tank and a clear water tank. Thetreatment process includes allowing sewage to flow automatically into a water collection tank, and then conveying the sewage to an adjustment tank for homogenization and amount equalizing; then feeding the sewage to the oil-water-residue separator and the air floatation tank to remove oil and remove residues; then discharging the sewage to the intermediate tank for homogenization and amount equalizing; then feeding the sewage into a bioflocculation tank to adsorb organic matters; then allowing upper-layer liquid of the sedimentation tank in the A section to flow into a biological selection tank for bacterium screening