The utility model discloses a magnetic compass deviation's trainer is rectified to sun method. Circular track, electric rail dolly, the solar light source of simulation and control system including magnetic compass, simulation sun moving trajectory, the control system and the driving motor of electric rail dolly carry out control connection, and the light source is installed on the electric rail dolly, and the electric rail dolly is installed on circular track to along circular orbital motion, the magnetic compass is installed under circular track center under control system's control, can carry out the rotation of 360 original places. Compared with the prior art, it has following beneficial effect: first, can accomplish sun method rectify the magnetic compass deviation training in laboratory environment, satisfy all training requirements that magnetic compass deviation was rectified to sun method, second, this trainer easy operation, degree of automation is high, the the training effect of third, this trainer is unanimous with marine real ship the training effect, the fourth, improved the training benefit, ensured training safety.