The invention relates to the field of cutter service life prediction, and discloses a cutter service life dynamic prediction method, which comprises the following steps: S1, determining features influencing the cutter service life, collecting related information data, obtaining historical data, and carrying out standardization processing on the historical data; s2, performing correlation analysis on the historical data, and deleting features of correlation within a critical range; s3, performing principal component analysis on the features, and performing dimension reduction and simplification on historical data to obtain modeling data; s4, using a gradient lifting regression tree to train modeling data, and establishing a cutter life prediction model; s5, collecting real-time data according to the characteristics of the modeling data, carrying out standardization processing on the real-time data, inputting the data into the tool life prediction model, and outputting to obtain the tool life; according to the dynamic prediction method for the service life of the cutter, the information data influencing the service life of the cutter is optimized, a perfect cutter service life prediction model is established, and the accuracy of cutter service life prediction is further improved.