The CAN-BUS is a kind of field BUS which have been widely applied at home and abroad. This paper describea a digital acquisition system based on CAN-BUS. The hardware includes an MCU (STC90C52RC) as the core, combining with CAN controller SJF1000 and CAN transceiver PCA82C251 t. The main program of the software circularly scans for collecting, processing and sending digital signal to the control PC. The design has been put into practical application in industry and it works well.