An AC current transformer energy obtaining circuit of the present invention comprises a current transformer, a rectifier and a stabilized voltage supply output circuit. The output end of the current transformer is connected with the AC side of the rectifier, and the stabilized voltage supply output circuit is used to connect loads. The AC current transformer energy obtaining circuit also comprises a high-voltage capacitor Cs and a starting circuit, when the voltage values of the two ends of the high-voltage capacitor Cs are less than a set value, the current transformer charges the high-voltage capacitor Cs via the rectifier, and the starting circuit disconnects the connection between the rectifier and the stabilized voltage supply output circuit, and when the voltage values of the two ends of the high-voltage capacitor Cs reach the set value, the starting circuit is triggered to connect the stabilized voltage supply output circuit and the DC side of the rectifier, and the high-voltage capacitor Cs discharges. According to the technical scheme provided by the present invention, when the high-voltage capacitor Cs discharges, the large-power energy is released within a short period of time, thereby solving the problem that the current transformer can not provide the large-power energy within the short period of time.