Sewage treatment device and treatment method

The invention belongs to the technical field of sewage treatment, and particularly relates to a sewage treatment device and method. The supporting platform is fixedly connected to the inner wall of the sewage storage well; a filtering and cleaning structure is arranged on the top surface of the supporting platform; the filtering and cleaning structure comprises a shell; the shell is fixedly connected to the top face of the supporting platform. The shell is in an inclined funnel shape, and the top of the shell is square. The shell is positioned at the bottom of a water inlet pipe of the sewage storage well; a through groove is formed in the middle of the supporting platform; the bottom of the shell penetrates through the through groove; a water outlet is formed in the bottom of the shell; a plurality of intercepting rods are uniformly arranged at the top of the shell; the distance between every two adjacent intercepting rods is smaller than the diameter of sundries needing to be intercepted. A cleaning unit is