Sewage graded filtering system capable of continuously filtering

The invention discloses a sewage graded filtering system capable of continuously filtering, which comprises a shell, a water inlet channel is arranged in the shell, the water inlet channel penetrates through the side wall of one side of the shell, a garbage groove is formed in the upper wall of the shell, the water inlet channel is communicated with the garbage groove, a garbage cleaning mechanism is arranged in the garbage groove, a liquid conveying channel is formed in the shell, a plurality of water filtering holes are formed in the lower wall of the water inlet channel and the lower wall of the garbage groove and communicate with the liquid conveying channel, a desilting opening is formed in the side wall of one side of the shell and communicates with one end of the liquid conveying channel, and the desilting opening is covered with a sealing plate. A liquid outlet channel is further formed in the shell. According to the sewage treatment device, sewage can be rapidly subjected to multi-stage filtration, g