The invention provides an inter-process communication method and a device, and relates to the technical field of computers. The inter-process communication method disclosed by the invention comprisesthe following steps: determining the data size of a communication message; applying for a shared memory from a memory allocator according to the data size, and obtaining an allocated shared memory address; storing the communication message into a shared memory according to the allocated shared memory address, and updating the state of the shared memory address storing the communication message; and sending the storage information of the communication message in the shared memory through the broadcast message, so that a receiver reads the communication message according to the storage information. Through the method, the shared memory can be applied based on the size of the communication message, so that a proper space is allocated to the communication message, space waste and fragmentationare avoided, the possibility of successful communication is improved, the possibility of queuing is reduced, and the reliability and efficiency of inter-process communication are improved.