An ultra-high-speed generator rectifier based on automatic energy consumption matching belongs to the field of power electronic converters. The invention solves the problem of energy mismatch between the independent power supply system for power generation and the load when the existing generator supplies power to the load by outputting a constant voltage through the electric energy converter. It includes three-phase rectifier bridge, buck step-down power converter, energy consumption matching circuit, drive circuit, controller and No. 1 capacitor C1; buck step-down power converter includes No. 1 power switch tube, No. 2 power switch tube, inductor and No. 2 capacitor C2; the energy consumption matching circuit includes No. 3 power switch tube and resistor R, the three-phase current input terminal of the three-phase rectifier bridge is connected with the three-phase current output terminal of the ultra-high-speed generator, and the positive pole power supply output of the three-phase rectifier bridge The terminals are simultaneously connected with one terminal of the No. 1 capacitor C1, the bus voltage signal input terminal of the controller, the positive power supply input terminal of the No. 1 power switch tube, and the positive power supply input terminal of the No. 3 power switch tube. It is mainly used in the field of generator rectification.