A leg lift mechanism for an electric bed or chair includes a primary frame, having a first structural component mounted with a bed frame and pivotally connected with a driver, a second structural component pivotally connected with the first structural component, a third structural component pivotally connected with the second structural component, a first angle bracket mounted with the second structural component, a lift bracket pivotally connected with the bed frame and abutted against the third structural component, and a second angle bracket mounted with the lift bracket. A link rod has an end pivotally connected with an extendable rod of the driver through a control pin inserted into a sliding slot of the first angle bracket, and the other end pivotally connected with the second angle bracket. Thus, the link rod can be driven by the driver to cause different movements of the primary frame.