The invention discloses an intelligent natural gas pipe network pressure energy power generating device. The intelligent natural gas pipe network pressure energy power generating device comprises a pipeline device system, a power generating system and an intelligent control system, wherein the pipeline device system comprises a first stop valve, a pressure regulating valve, a solenoid valve, an electric regulating valve, a fluid motor, a pressure temperature balancer, a check valve and a second stop valve which are connected in sequence between a high-pressure pipe network and a low-pressure pipe network; the power generating system comprises a power generator which is connected with the fluid motor, and a constant voltage and constant frequency power supply which is connected with the power output end of the power generator; the intelligent control system comprises a PLC (Programmable Logic Controller), a pressure transmitter, a first temperature and pressure transmitter, a second temperature and pressure transmitter, a third temperature and pressure transmitter, a rotating speed transmitter, an online methane monitor, and a liquid sensor. The invention also provides a control method for the intelligent natural gas pipe network pressure energy power generating device. According to the device and the control method, the comprehensive high-efficiency utilization of a power storage system and the power generating system is realized; unmanned operation of a plant can also be realized; a large amount of manpower is saved; the personnel security of the plant is ensured.