Provided is an electric-vehicle slip control device that enables highly accurate slip control by correct detection of wheel revolutions regardless of the vehicle speed. The electric-vehicle slip control device includes a slip control means (28) that: detects the presence of a slip state from driving-wheel revolutions and driven-wheel revolutions that are measured by respective revolutions-observation means (23, 21); and, when there is a slip state, performs a continuous slip control that decreases the torque command to the motor (3) for a control-repeating period. The device also includes a vehicle speed detection means (29) that detects the vehicle speed, and a control-repeating period changing means (30) that extends the control-repeating period of the slip control means when the vehicle speed detected by the vehicle speed detection means (29) is within a defined low-speed region.