The invention discloses novel automatic twin-wire thermal zinc spraying equipment for thermal zinc spraying of a large-size casting. The casting is fixedly placed on a flat wagon; the novel automatic twin-wire thermal zinc spraying equipment comprises an automatic twin-wire zinc spraying controller, two zinc wire rollers, a spraying head, a six-shaft robot and an unwinding motor, wherein zinc wires of the two twin zinc wire rollers are connected to the unwinding motor through a fixing bracket; the unwinding motor drives the fixing bracket to move to unwind the zinc wires; the two unwound zinc wires are fixed on the six-shaft robot through the spraying head; the six-shaft robot is connected with the automatic twin-wire zinc spraying controller to realize zinc plating of the casting placed on the flat wagon. According to the novel automatic twin-wire thermal zinc spraying equipment, the surface corrosion resistance of a component is improved, and the service life of the component is prolonged; the six-shaft robot is matched with the novel automatic twin-wire thermal zinc spraying equipment to spray zinc to the surface of the component, and the working strength of an operator is reduced.