The invention discloses an overtravel alarming and resetting stretcher and a stretching method of the overtravel alarming and resetting stretcher and belongs to the technical field of stretchers. The overtravel alarming and resetting stretcher comprises a base, a connector, an oil cylinder, a piston, a pull rod and an end cover. The base is located on the lower portion of the oil cylinder. The pull rod is arranged inside the oil cylinder. The piston is arranged in the radial direction of the oil cylinder and the pull rod and matched with the oil cylinder and the pull rod. The end cover is arranged on the upper surface of the oil cylinder. Springs are evenly arranged between the end cover and the piston. The connector communicates with the oil cylinder and located on the outer portion of the oil cylinder. The overtravel alarming and resetting stretcher further comprises an alarming switch, an elastic paster and a gearbox, wherein the alarming switch is located inside the end cover, the elastic paster is located on the lower surface of the end cover and located on the same straight line with the alarming switch, the gearbox is in contact with a pre-load nut in the base. The alarming switch comprises an LED lamp bead and a button cell, wherein the LED lamp bead, a buzzer, the button cell and the elastic paster are sequentially connected in series. The overtravel alarming and resetting stretcher aims to solve the problem that in the prior art, after a stretcher exceeds a travel, the stretcher is prone to damage, and the overtravel alarming and resetting stretcher can achieve overtravel reminding and is protected against damage caused by overtravel.