The invention belongs to the lifting field of wind-turbine blades, and discloses a lifting appliance device for installing wind-turbine blades, and an operation method. The lifting appliance device for installing the wind-turbine blades comprises a lifting rope, a main beam lifting frame, horizontal walking mechanisms and fixture devices. The lifting rope is connected onto a lifting ring of the main beam lifting frame. The main beam lifting frame is welded by adopting double-layer structural steel; and a diesel engine, an electrical cabinet, a hydraulic station and a walking hydraulic cylinderare arranged on the main beam lifting frame. The horizontal walking mechanisms are arranged at two ends of the length direction of the main beam lifting frame. The fixture devices are arranged underthe horizontal walking mechanisms. According to the lifting appliance device for installing the wind-turbine blades, and the operation method provided by the invention, double clamping mechanisms areadopted, so that the safety on lifting fan blades can be ensured; and the clamping span of the horizontal direction of two pairs of clamping hands can be dynamically adjusted according to the blade length. The lifting appliance device for installing the wind-turbine blades provided by the invention adopts full hydraulic drive so as to be high and stable in torque, high in environment adaptability,long in service life, and convenient to operate, and can realize the advantages of controllability, adjustability and high safety during work.