The invention provides a flutter recognition method and system based on a convolutional neural network. The flutter recognition method comprises the following steps that cutting noises under differentprocess parameters are obtained under experimental working conditions and are subjected to filtering treatment to obtain a clipped noise cochlea spectrum; a convolutional neural network is trained according to the obtained clipped noise cochlea spectrogram to obtain a trained convolutional neural network; the cutting noises in the actual cutting process are collected, filtering processing is carried out on the cutting noises, whether flutter occurs in the cutting process or not is judged according to the trained convolutional neural network. According to the flutter recognition method and thesystem, whether the flutter occurs is judged by adopting the cutting noise generated in the cutting process, a processing machine tool and a processing workpiece do not need to be contacted when thecutting noise is detected, the applicability is high, and the problem of poor applicability of the method for detecting the flutter in the prior art can be solved.