Garbage compressor and self-gravity rotary type sewage collecting device thereof

The invention discloses a self-gravity rotary type sewage collecting device of a garbage compression truck. The self-gravity rotary type sewage collecting device comprises a box body used for collecting garbage, a rear door cover, a first sealing element, a sewage box and a rotary baffle plate, wherein the rear end of the box body is provided with a garbage dumping hole; the rear door cover is arranged at the rear end of the box body; the sewage box is arranged at the lower side of the rear door cover; the sewage box comprises a bottom plate, a cover plate, a plate, a rear plate and two side plates; a plurality of water leakage holes are formed in the cover plate; a sewage discharge hole is formed between the front end of the cover plate and the top end of the front plate; the rotary baffle plate can be rotatably mounted at the swage discharge hole; when the rear door cover is closed, the rotary baffle plate closes the sewage discharge hole under the action of the self-gravity, and the rotary baffle plate rot