The commonly used anti-jamming algorithm for adaptive zeroing satellite navigation can well suppress theinterference, but the anti-jamming will distort the phase of the satellite signal, resulting in that the satellite signal after anti-jammingcannot be used for high-precision positioning. The digital multi beam anti-jamming algorithm is studied. By constraining the satellitedirectional signal, the anti-jamming is achieved while ensuring the phase stability of the satellite signal to achieve high-precisionpositioning. The algorithm analysis and actual sampling data is simulated and verified.