The study is carried out on a typical supraharmonic source-electric vehicle charger. The supraharmonic emission model of a Vienna circuit under space vector modulation based on in-phase/inverse stacked carrier is established, and the expression of the supraharmonic voltage of the Vienna circuit is deduced. A supraharmonic emission equivalent model of a multi-module parallel-based three-phase Vienna charger is established. It deduces the expression of the supraharmonic current of the charger, and analyzes the influence of network impedance, filter impedance, background harmonics and other parameters on the amplitude of the supraharmonic emission of the charger. The research shows that the supraharmonics of the three-phase Vienna charger have the characteristics of narrow-band emission centered on the switching frequency. The supraharmonic emission of chargers based on in-phase stacked carrier SVM modulation only contains odd-order carrier harmonics. Even-order sideband harmonics only exist at the odd-order carrier multiplier, and odd-order sideband harmonics only exist at even-order carrier harmonics. The characteristic harmonics of the supraharmonic emission of chargers based on inverted stacked carrier SVM modulation are mainly concentrated at the odd-order sideband harmonics of the switching frequency and its multiples. Finally, the correctness of the theoretical model is verified by simulation and actual test. This work is supported by the National Natural Science Foundation of China (No. 51777066).