The invention belongs to the technical field of deep well mine filling and pipeline delivering, and relates to a deep well pipeline delivery pressure relieving and filling device and a using method. The deep well pipeline delivery pressure relieving and filling device is composed of a filling pipeline, a pressure relief tank, a one-way valve, a pressure measurement instrument, a line pipe, a filling station, a cork base plate and angle steel. According to the device, the pressure and the pipe explosion risk of a pipeline can be reduced, the pipeline delivery stability can be improved, the flowing speed of slurry at a pipeline outlet and the separation rate of the slurry can be decreased, the slurry strength can be guaranteed, the pipeline wall thickness can be decreased, the service life of the pipeline can be prolonged, the safety performance of the pipeline can be improved, and the strength of goaf filling bodies can be guaranteed.