A limiting structure for the synchronous limit of actuating cylinders comprises a first unloading loop, a second unloading loop and loop connecting-disconnecting mechanisms. The unloading loops are connected with a high pressure inlet oil passage, and one connecting-disconnecting device corresponding to the position of each actuating cylinder is arranged on the unloading loops and used for controlling connection and disconnection of the unloading loops when the actuating cylinder retracts to a design permissible minimum value. Each connecting-disconnecting device is composed of a plug body and a cavity. Each loop connecting-disconnecting mechanism comprises a connecting rod and a mounting seat, wherein the mounting seat is fixed on a cylinder body of an engine. The loop connecting-disconnecting mechanisms and the actuating cylinders are the same in number. The limiting structure for the synchronous limit of the actuating cylinders has the advantages of being mainly applicable to limiting of the synchronous limit of aero-engine vectoring nozzle actuating cylinders and also suitable for other similar functional areas. All mechanical mechanisms are utilized for achieving functions, so that the limiting structure for the synchronous limit of the actuating cylinders is reliable in operation and can effectively prevent the actuating cylinders from keeping on working when the actuating cylinders synchronously exceed a design permissible limit value, and therefore the effect that a nozzle moving mechanism is protected from damage is achieved.