The invention discloses a double-cylinder straw compressing, packaging and bagging machine, which comprises a motor, a hydraulic oil pump, a feed box, a compressed oil cylinder, a bag feeding oil cylinder, a control box and a hydraulic oil exchanger. The double-cylinder straw compressing, packaging and bagging machine is characterized in that the upper side of the feed box is connected with a feeding box and the motor; the motor is connected with the hydraulic oil pump through a belt wheel and a triangular belt; the hydraulic oil pump is connected with the hydraulic oil exchanger; the hydraulic oil exchanger is connected with the compressed oil cylinder through a compressed oil inlet pipe and a compressed oil return pipe; the compressed oil cylinder is connected with a compressing piston; the hydraulic oil exchanger is connected with the bag feeding oil cylinder and a bag feeding piton through bag feeding oil inlet and outlet pipes. The motor is used for driving the hydraulic oil pump to work through the triangular belt, hydraulic oil is conveyed into the compressing oil inlet and outlet pipes and bag feeding oil inlet and outlet pipes through the hydraulic oil exchanger; when the hydraulic oil cylinder is under the action of oil pressure, the compression piston compresses in a reciprocating way. When the bag feeding oil cylinder is under the action of oil pressure, the bag feeding piston moves in a reciprocating way, and compressed bags are conveyed out of a bagging port.