Abstract: Photovoltaic pile driving requires ensuring the accurate installation position of photovoltaic panels to ensure the neat arrangement of photovoltaic arrays and optimal lighting effect. This requires the positioning accuracy of pile driving equipment to reach millimeter level, and traditional positioning methods are often difficult to meet such high-precision requirements. This paper proposes a positioning method of mudflat photovoltaic piling equipment based on GPS-RTK technology. By setting a reference station in the open area far away from interference sources, building a system based on single station RTK and GPS service mode, determine a reasonable base station spacing to optimize network performance. Install mobile station equipment on pile driving equipment, receive satellite signals and reference station information, eliminate error sources through double difference processing, and obtain the precise position of the mobile station. Through field testing and testing using network RTK measurement technology standards, GNSS receivers were selected and multiple sets of observations were conducted. The results show that the positioning error values of 35 test points are strictly controlled-0.5 mm to 0.5 mm, and the positioning time of the experimental group is only 10 s. This method significantly improves the positioning accuracy and efficiency, and provides reliable technical support for the construction of mudflat photovoltaic projects.