Aimed at the problems that damage or rupture of the hydraulic pipe caused by the friction between the hydraulic pipes, or between the hydraulic pipes and the body structure or equipment cabinet can lead to failure of the system, a method is proposed for detecting the frictional damage of the aircraft hydraulic pipe based on acoustic emission technology. A correct judgment of pipes whether there is abrasion damage of the catheter stems from in analyzing the characteristic parameter, feature extraction and damage pattern recognition in the range of time domain through detecting the acoustic emission signal of the abrasion damage of the catheter. In this paper, the definition of pipe grinding is defined, the physical process and mechanical damage mechanism of pipe grinding are introduced in detail, the characteristic parameters of acoustic emission signal are analyzed and processed by using correlation graph analysis, and the damage detection experiment of hydraulic pipe grinding under vibration load is carried out on the aircraft. The results show that the detection method is feasible.