The invention relates to a modular multi-
data conversion device and a 
conversion method thereof. The modular multi-
data conversion device consists of a core control module based on an ARM Cortex core 
microprocessor, a power supply module, a keyboard setting module, an LED (
Liquid Crystal Display) module and selectable communication modules including a 
bluetooth module, a Zigbee module, a CAN (Controller 
Area Network) module, an RS485 module and a 
Profibus module. The modular multi-
data conversion device is characterized in that the selectable communication modules can be plugged in the communication interfaces of the core control module of the ARM Cortex core 
microprocessor according to actual needs to realize 
data format conversion and 
data transmission among various communication data. By adopting the design scheme that the high-performance processor based on an ARM Cortex core as a core control 
chip, by adopting a tailorable modular installation method in the aspect of hardware and by using the high-speed 
processing characteristic of the ARM Cortex core 
microprocessor, the functions of data conversion and transmission among various communication data are realized very conveniently and the modular multi-data conversion device has the advantages of high 
processing response speed, small size, higher flexibility, higher environmental adaptability and the like.