An electric chuck device relates to a general type of clamp for clamping a workpiece widely used in the mechanical field. The utility model is composed of an electric chuck device clamping function unit, an electric chuck device power function unit, an electromagnetic friction clutch assembly, a chuck body shell and an electromagnetic brake assembly. When the electromagnetic brake assembly is energized, the electric chuck device clamping function unit is integrated with the headstock and does not rotate; the electromagnetic friction clutch assembly is energized, and the electric chuck device power functional unit transmits the rotary motion to the jaws to clamp or loosen Open the workpiece. During the machining process, only the electric chuck device clamping function unit rotates with the spindle, and the electric chuck device power function unit does not rotate with the spindle. Compared with the prior art, the invention effectively reduces the number of parts and the quality of rotation with the spindle, is beneficial to improve the quality of the spindle dynamic balance, is easy to serialize and standardize design and manufacture, and has a simple and compact structure, which is convenient for installation and maintenance.