The hollow rotor screw pump matching surface water injection system is mainly aimed at the well conditions in which the water volume is small (or the water production is not stable) and the coal powder concentration is large in the process of coal-bed methane well drainage and production, resulting in the gas production is not stable. It can be used to continuously discharge coal powder in large quantities under normal production conditions, and effectively control the external displacement according to the drainage and production system to ensure the normal drop of flow pressure. To achieve stable and continuous production of coalbed methane Wells.