The invention discloses an excitation voltage regulator for a claw-pole generator. The excitation voltage regulator comprises a control circuit, a driver circuit, a power loop and a feedback unit. The input end of the control circuit is connected with the output end of the feedback unit; the output end of the control loop is connected with the input end of the driver circuit; the output end of the driver circuit is connected with the input end of the power loop; and the output end of the power loop and the input end of the feedback unit are connected with an excitation winding of the claw-pole generator. The feedback unit acquires an actual output voltage of the claw-pole generator in real time; and the control circuit changes the width of an output pulse according to a difference value of a given voltage value and a feedback voltage output by the feedback unit to adjust a voltage applied to the excitation winding of the claw-pole generator so as to achieve the effect of stabilizing the output voltage of the claw-pole generator. The excitation voltage regulator is simple in circuit, easy to realize, strong in anti-jamming capability, wide in working voltage range and high in system stability.