The invention provides a method and a system for interaction between different operating system platform whiteboards. According to the method and the system, in the process of data and instruction interaction, JSON is adopted to serialize interaction data and code an instruction, and then, the serialized interaction data and the coded instruction are sent to other operating system platform whiteboards. After the serialized interaction data and the coded instruction are received, first, the coded instruction is decoded to acquire an operation object, then, the operation object is de-serialized and reduced to a whiteboard object, and finally, specified operation is performed on the whiteboard object to realize synchronous operation on different operating system platforms. In the whole process, JSON serialization / de-serialization is adopted, JSON, a lightweight data exchange language, is text-based and is easy for people to read, the system is easily compatible with other equipment, and the scalability of different operating system platform whiteboards is enhanced. In addition, after JSON serialization, transmission data reduces the amount of interaction data, the requirement of data interaction on bandwidth is reduced, and real-time interaction and synchronization of different operating system platform whiteboards can be achieved.