A coating data processing method and device, and a computer-readable storage medium. The method comprises: acquiring print data in a coating mode (S1), extracting splicing data from the print data (S2), and generating spray print data according to basic parameters and the splicing data (S3). The method realizes a coating data generation solution with high execution efficiency and low bandwidth occupation. First, the data channel pressure of a control chip is reduced, second, the data transmission time is reduced, and furthermore, printing efficiency is improved and printing power consumption is reduced.