The invention provides a CAN (control area network) open slave station system based on a DSP (digital signal processor) 28335. The CAN open slave station system is based on a DSP 28335 hardware platform, can be applicable to an embedded operating system or a state machine system constructed on a foreground-background system, comprises a CAN communication management module, an object dictionary management module, a network management module, a timer management module, a communication object management module and the like, and completes basic tasks of the CAN open such as PDO(process data objects), SDO(service data objects), NMT(network management objects), synchronous message processing and the like. By the aid of the CAN open slave station system based on the DSP28335, a 301 protocol function in a CIA protocol is completely achieved. The CAN open with targeted optimization can be transported from node functions to a CPU of the same series after simple modification on the DSP28335 platform, so that transportability is achieved. Codes can be reduced, system resource occupation is low and timeliness is high. Due to high applicability, various node functions can be achieved only with simple configuration, and the CAN open slave station system is low in development cost and convenient in maintenance and function expansion.