The invention discloses an energy-saving shell powder grinding device and particularly relates to an environment-friendly garbage can. The device comprises a grinding chamber, a recycling chamber, anelectric appliance chamber, solar panels, a storage battery, a motor and grinding rollers; the electric appliance chamber and the grinding chamber are arranged side by side, the recycling chamber is formed below the grinding chamber, the solar panels are disposed on the outer surfaces of the grinding chamber and electrical appliance chamber, and the electrical appliance chamber is internally provided with a controller, the storage battery and the motor which are connected in sequence; the storage battery is connected with the solar panels, the solar panels convert the solar energy into electrical energy, and the electrical energy is stored in the storage battery; the two grinding rollers are arranged horizontally side by side in the grinding chamber, a main shaft of one grinding roller isin transmission connection with a driving shaft of the motor, and main shafts of the two grinding rollers are sleeved with gears which are meshed with each other; the outer surfaces of the two grinding rollers are provided with toothed protrusions, and the toothed protrusions of the two grinding rollers are meshed with each other when being in contact with each other. An opening is formed above the grinding chamber, a cover plate is hinged to the opening of the grinding chamber, and a filtering net is arranged at the junction between the recycling chamber and the grinding chamber.