The utility model discloses a marsh gas generating device raises pigs. The device includes: the methane -generating pit body, the top of methane -generating pit body is equipped with one deck solar cell panel, the inside one deck filter screen that is equipped with of methane -generating pit body, the left side fixed mounting of methane -generating pit body has the feed inlet, the feed inlet has material pumping pump through the hose connection, the top fixed mounting of feed inlet has the bracing piece, the upper end of bracing piece is connected with the roller blinds motor who sets up at methane -generating pit body top, roller blinds motor's the other end has the over blanket through the pivot winding, the right side of methane -generating pit body is equipped with the discharge gate, the position of discharge gate and the position phase -match of filter screen, solar battery is installed to the top of discharge gate, solar battery is connected with solar cell panel and over blanket electricity respectively, the solar battery top is equipped with the motor, and the motor passes through the belt and is connected with the agitator rotation that sets up in the methane -generating pit body, methane -generating pit body left side still is equipped with the controller, and motor and roller blinds motor are connected with control is electromechanical respectively.