Aiming at the problems of the rotating biprism system, such as the difficulty of solution, many error sources and low pointing accuracy, a correction method is proposed to compensate the rotation angle of the rotating biprism pointing system. In this paper, the relationship between the beam pointing error and the prism angle error is established by solving the partial derivative and establishing the total differential equation, and the compensation angle is calculated. Experiments have verified that in 99.57% of the pointing area, the maximum pointing deviation is reduced from 1.8742° to 1.4753°, and the root mean square is reduced from 0.1401° to 0.0893°. The compensation prism angle correction method can effectively improve the pointing accuracy.