The invention discloses an automobile waste gas treatment device. The device comprises a shell, a connecting tube is arranged at one end of the shell, the other end of the shell is fixedly connected with a baffle through a bolt, and an exhaust pipe is arranged on the side, opposite to the shell, of the baffle. A connecting flange is arranged at the end, opposite to the shell, of the connecting pipe. An air inlet partition plate is arranged in the connecting pipe, and a first limiting plate and a second limiting plate are arranged on the side, opposite to the connecting pipe, of the connectingflange. The second limiting plate is located above the first limiting plate, a second screw rod penetrates through the second limiting plate, and a second clamping plate is arranged at the bottom endof the second screw rod. The baffle, a pull rod and a cleaning ring are arranged, so that after the device is used for a period of time and when a user needs to clean carbon deposit on the inner wallof the shell, a large amount of carbon deposit cannot be accumulated in the shell, the carbon deposit removing efficiency is improved, the waste discharge efficiency is improved, and the phenomenon that automobile tail gas exceeds a standard is avoided.