The modulating type electric butterfly valve which consists of a direct mounted quarter-turn electric actuator and a butterfly valve, also adopts shaft abutment and is connected and matched with a flange. The product is mainly suitable for systems, such as petroleum, chemical engineering, food, medicine, light textile, papermaking, power station, shipping, smelting and water supply and drainage; a pipeline is matched with a DCS (data communication system) or a DDZ-series meter, and the product can be mounted on various corrosive and non-corrosive gas, liquid, semi-fluid and solid powder pipelines and containers, so as to perform automatic regulation and remote control.