The present invention discloses an electric wheelchair featuring integration of sitting, lying, standing, and lifting functions, which comprises: a coupling bed/chair part, a base, and an auxiliary frame. The base includes a lifting mechanism pivotally connected to the coupling bed/chair unit and has at least a lowest position, a middle position, and a highest position. Accordingly, when the lifting mechanism is located at the lowest position, the coupling bed/chair part presents a flat expanded state when the lifting mechanism is lifted from the lowest position to the middle position, the coupling bed/chair part is coupled from the expanded state to the seat state and when the lifting mechanism is lifted from the middle position to the highest position, the coupling bed/chair part is coupled from the seat state to the upright expanded state. Therefore, the present invention combines advantages and efficacies of driving four different actions with a single power and single degree of freedom, stable actuation, and low cost.
