The invention discloses a friction overtorque protecting structure and relates to the technical field of friction overtorque protecting structures. The friction overtrorque protecting structure comprises a drive end flange, friction plates, a copper bush, a pressure plate, a pressing plate, a driven end flange and a disc spring. One end of the drive end flange is sleeved with the pressure plate. The driven end flange is arranged between the pressure plate and the drive end flange. The friction plates are arranged on the end surfaces of the upper and lower sides of the driven end flange correspondingly. The friction plates make contact with the drive end flange. The copper bush is arranged in the position, making contact with the drive end flange, of the inner side of the driven end flange.The end, away from the drive end flange, of the pressure plate is connected with one end of the disc spring. The other end of the disc spring is connected with the pressing plate. When the friction overtorque protecting structure is disengaged, torque can still be transmitted, normal operation of a unit can be guaranteed, and it is guaranteed that a main machine has no runaway phenomenon; disengaging can be tolerated for a plurality of times; automatic reset is achieved, no operation is needed, and after overload torque is eliminated, synchronous reset can be achieved as a main machine is started; and the slipping torque precision is high and adjustable, the slipping torque is mainly achieved by adjusting the compression amount of the disc spring, and since the disc spring is stable in performance, the adjusting precision and repeating precision are high.