The invention discloses an active sound synthesis method for a vehicle. The method comprises the following steps: collecting all sounds of a real vehicle of a target vehicle model under different working conditions; extracting order sound characteristics of all sounds, enhancing or weakening the order sound characteristics, and selecting a sound scheme conforming to a vehicle style as a synthetic sound; performing sound parameterization processing on the synthesized sound; the rotating speed, the speed and the accelerator pedal opening degree of the vehicle are obtained; constructing a sound database in which the sound parameterized ACD file is in one-to-one correspondence with the vehicle rotating speed, the vehicle speed and the accelerator pedal opening parameters; the sound database is implanted into the whole vehicle, the rotating speed, the vehicle speed and the accelerator pedal opening parameter signals output by the vehicle are matched with the sound parameterization ACD files in the sound database, then the corresponding sound parameterization ACD files are restored into audio streams in real time, and a vehicle loudspeaker is driven to emit the audio streams. The sound synthesized by the method is good in coherence, good in listening feeling, natural and real, multiple in style type and high in sound quality.