The invention provides a high-frequency single-phase inverter for a motor train unit, which comprises an input circuit connected with a direct-current storage battery, and is characterized in that the output end of the input circuit is connected with an interleaved Boost voltage increment circuit capable of boosting direct-current voltage to be 300 V; the output end of the interleaved Boost voltage increment circuit is connected with a phase-shifted full-bridge circuit capable of converting the 300-V direct-current voltage into 350-V direct-current voltage; the output end of the phase-shifted full-bridge circuit is connected with a single-phase inverter circuit capable of converting the 350-V direct-current voltage into single-phase 220-V alternating-current voltage; the input circuit, the interleaved Boost voltage increment circuit, the phase-shifted full-bridge circuit and the single-phase inverter circuit are integrally arranged. According to the high-frequency single-phase inverter for the motor train unit, the volume and the weight of the inverter are reduced, and the cost is saved.