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In order to analyze the influence of electrostatic discharge electromagnetic pulse field on the flow-injection discharge of needle-plate gap in natural environment, based on the fluid dynamics theory, the flow-injection discharge model under electrostatic discharge electromagnetic pulse field was established, and the flow-injection discharge process of 10 mm needle-plate gap under atmospheric pressure was simulated. The influence of electrostatic electromagnetic pulse field on the electric field and photon flux in the development of flow-injection movement was studied, and the variation law of flow-injection discharge gap penetration time under different electrostatic electromagnetic pulse fields was obtained. The results show that when there is no electrostatic discharge pulse field, the streamer develops towards the cathode with the passage of time. When the streamer head is close to the cathode, the electric field intensity of the streamer head gradually increases, and the photon flux amplitude also increases rapidly. After the electrostatic discharge pulse interference field is applied, the electric field is obviously accelerated to the plate electrode in the same time, and the breakdown voltage threshold is obviously reduced. With the increase of electrostatic discharge output voltage, the time of flowing through the gap is gradually reduced. It has reference significance for the research of safety protection measures for spacecraft in-orbit operation under strong electromagnetic field environment. [ABSTRACT FROM AUTHOR]