Sewage treatment device

The utility model relates to the technical field of sewage treatment, and discloses a sewage treatment device which comprises a treatment assembly, the treatment assembly comprises a tank body, wherein a stirrer is arranged on the top surface in the tank body; the feeding hole is formed in the top of the tank body; the discharge hole is formed in the bottom of the tank body; a separation assembly is arranged on the tank body; the separation assembly comprises a rotating roller which is rotationally connected to the top of the tank body; sewage is discharged into the tank body and stirred after a purifying agent is added, finally, a motor is started to enable a separation plate to slide upwards until the separation plate slides to the upper portion of the tank body, residual oil and sludge on the top of the separation plate penetrate through the tank body and enter a collection box, a stirrer is started to enable a scraper to rotate, and the residual oil and sludge remaining on the separation plate are scraped