Abstract: To cater to the need for coordinated control of a group of filter presses, a STM32-based controller with CAN communication function is specifically developed. The controller operates with STM32F103ZET as the core and only such peripheral circuits as I/O and EEPROM are required. The software for the controller is developed based on the Free RTOS operating system which has divided functions for executing different assigned tasks. Through the use of the STM32 chip's built-in CAN controller, it is possible to perform intercommunication and control functions for all operating filter presses.