NOVELTY - The feeding-slagging device of injection-type conveying straw fiber material comprises a material piston injection cylinder (1), a first piston (2), a second piston (3), a power cylinder (4), a material-absorbing one-way valve (5), and a discharging one-way valve (6). The material piston injection cylinder is connected with the power cylinder. The first piston is held in the injection cylinder. The second piston is held in the power cylinder. The first and second pistons are connected via a connection rod. The power cylinder is provided with a first pressure pipe and a second pressure pipe.    USE - Used as a feeding-slagging device of injection-type conveying straw fiber material.    ADVANTAGE - The feeding-slagging device has simple structure and high durability, and is convenient to feed and slag.    DETAILED DESCRIPTION - The feeding-slagging device of injection-type conveying straw fiber material comprises a material piston injection cylinder (1), a first piston (2), a second piston (3), a power cylinder (4), a material-absorbing one-way valve (5), and a discharging one-way valve (6). The material piston injection cylinder is connected with the power cylinder. The first piston is held in the injection cylinder. The second piston is held in the power cylinder. The first and second pistons are connected via a connection rod. The power cylinder is provided with a first pressure pipe and a second pressure pipe. The first and second pressure pipes are arranged on different sides of the second piston so as to enable the second piston to move by reciprocating to feed and discharge slag. The material-absorbing one-way valve and the discharging one-way valve are connected to the material piston injection cylinder. A feeding pipe is connected to the material-absorbing one-way valve. A discharging pipe is connected with the discharging one-way valve. A washing agent interface is arranged on the material piston injection cylinder.    DESCRIPTION OF DRAWING(S) - The diagram shows a schematic view of a feeding-slagging device.    Material injection piston cylinder (1)    First piston (2)    Second piston (3)    Power cylinder (4)    Material-absorbing one-way valve (5)    Discharging one-way valve. (6)