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In order to solve the problem that the magnetic vector of three axes under the measuring system is not parallel to the missile system caused by the mechanical installation error and fixed magnetic interference during the flight of the magnetic measuring system for rotating missile, an online calibration and compensation method for the equivalent installation error Angle between the magnetic measuring system and the missile body was proposed. The error model of measurement information and error is established by analyzing the real-time output of the magnetic survey system's triaxial geomagnetic vector information, and the error Angle is obtained by using the characteristic value of sinusoid-like signal, and then the error term in the magnetic survey information is compensated, and the accuracy of the output roll Angle of the magnetic survey system is finally improved. The experimental results show that when the projectile body only rolls, the accuracy of roll Angle calculated by the magnetic measuring system after compensation is more than 6 times higher than that before compensation, and the error of roll Angle calculation is kept within 2°, which can meet the precision requirement of guided ammunition for roll Angle.