The utility model discloses a trash can. The trash can comprises a trash can main body, wherein the trash can main body is separated into a top can and a storage can through a horizontal partition plate; the partition plate is uniformly separated into four small partition plates which are controlled by a steering gear II arranged on the side wall of the trash can main body, and a weight sensor is arranged on the partition plate; the top can is provided with a can cover and a trash bag, wherein the can cover is controlled by a steering gear I, a rubber band is arranged at a sealing opening of the trash bag, and a groove for fixing the rubber band is formed in an outer wall of a top can opening; a discharge port is formed in the side wall of the storage can, and a pressure sensor and a control module are arranged at the bottom of the storage can; a power module, a display screen and a global system for mobile communication (GSM) module are also arranged on the trash can main body, and the weight sensor, the pressure sensor, the steering gear I, the steering gear II, the display screen and the GSM module are connected with a control module; and the trash can further structurally comprises a signal receiver which is matched with the GSM module. The trash can automatically packs trash with enough weight and informs the maintenance personnel to change a trash bag in real time, so that environmental sanitation is maintained.