The three-dimensional braille printer based on STM32 is a printer specially designed for the blind. It prints braille text materials for the blind to read, improves the reading rate of the blind, improves the life of the blind, and makes special people feel the life changes brought about by the development of science and technology. This project uses STM32F1 series microprocessors embedded in ARM Cortex-M3 core as the main control chip to control the operation of the machine and realize intelligent and automatic printing. Since the writing method of Braille is different from normal characters, it is recorded by the concave and convex points on the paper surface, so the printing method of this project is completed by mechanical arm. The main function of this project is to print braille, send text materials to the main control chip through a personal computer, and the main control chip prints real-time according to the received data, prints the text materials into braille, and supplies special people to use.