Quantum positioning sstem (QPS) has the characteristics of high positioning accuracy and high safety factor. However, sandstorm can cause great changes in optical quantum entanglement degree, which will further affect the positioning error of quantum positioning system. In this case in order to reduce the positioning error, an optimal entanglement degree adaptive (OEDA) strategy to resist sandstorm interference is proposed based on switching strategy of dual-satellite satellite-ground link. The relationships between each parameter of the sandstorm, transmission distance and the entanglement degree are established. And the positioning error caused by the global feature of sandstorm is compared before and after the adaptive adjustment of the system. The simulation results show that when the overall characteristic aggregation factor of sandstorm is 10 and the transmission distance is 10 km, the system positioning error is reduced from 0.14 m to 0.02 m by using OEDA algorithm. Thus it is known that the accuracy of QPS in sandstorm can be improved by using OEDA strategy.