Online monitoring method and module for numerical control engraving and milling system

The invention discloses a numerical control engraving and milling system online monitoring method and module. The method comprises the following steps that S1, an AI system obtains a projection center; s2, establishing a reference; s3, performing visual detection; s4, position judgment and cutter feeding machining are carried out; s5, correcting a theoretical projection center; and S6, the cutter feeding amount is adjusted. A three-dimensional coordinate system is established by taking the initial projection center of the machined part as a reference, and the actual projection center position of the machined part is obtained after one-time machining is completed through visual detection by taking the coordinate reference of the three-dimensional coordinate system as the theoretical projection center of the machined part; whether the machined part displaces or not is judged by comparing whether the actual projection center of the machined part and the theoretical projection center of the machined part are over