The invention discloses an extension displacement check valve for an emergency rescuing draining pipeline of a coal mine deviated well. A draining pump and a draining sluice valve of the draining pump are sequentially communicated with a lower draining pipeline, an extending draining pipeline and an upper draining pipeline; a displacement check valve is arranged inside the upper draining pipeline; when the pipeline is in urgent need of extension for emergency drainage, the extending draining pipeline is connected between the upper draining pipeline and the lower draining pipeline by movement of the displacement check valve, and then the draining sluice valve is opened for draining water. The extension displacement check valve disclosed by the invention is used for solving the problem of back flowing of pipeline water when a new pipe is connected for prolonging the draining pipeline during drainage for emergency rescuing of the coal mine deviated well and realizing the aims of rapid connection and rapid drainage by prolonging the draining pipeline under a coal mine well.