The invention discloses a permanent-magnet-excitation vehicle-mounted generator. The generator mainly comprises a front end cover, an air-out protective cover, a stator, a rotor, an outgoing line box, an exciter stator, an exciter rotor, an air-inlet protective cover, a rear end cover, a U-shaped dehumidifying heater, a permanent magnet machine stator and a permanent magnet machine rotor. The generator is characterized in that a generator reactance and a waveform distortion rate are small; motor stator winding end portions are fully bound through using a viscidity glass fiber tape; two ends are provided with end hoops respectively; a stator outgoing line is strapped on a fixed hook; a stator winding, a rotor winding, an exciter stator winding, an exciter rotor winding and a permanent magnet machine stator winding are sprayed with three-proofing lacquer; an air inlet of the motor is provided with a sand prevention net; the motor is provided with the dehumidifying heater; an outgoing line copper bar in a wiring box is made into a 90 degree folding structure; and a box body cover plate is provided with a waist-shaped outgoing line hole. The generator has advantages that the structure is compact; a vibration resistance capability is high; reliability is good and installation and maintenance are convenient; the structure is especially suitable for the vehicle-mounted generator with a large-pulse non-linear load.