Abstract: An information translation device, information translation method, and an information translation system based on Modbus are provided. The client module of the information translation device receives an information model file including identity information, receives a sensor signal corresponding to first identity information and Modbus data including memory addresses of Modbus protocol, determines a first memory address corresponding to the sensor signal according to sensed values of the sensor signal and values corresponding to each of the memory addresses and builds a memory address mapping table including the first memory address and the first identity information, and receives a first value of the first memory address and searches the first identity information corresponding to the first memory address according to the memory address mapping table. The server module of the information translation device receives the first value and the first identity information and transmits to an OPC UA device.