The invention discloses a communication system of a hardware abstraction layer of a universal processor in a software communication system structure. The communication system comprises a hardware abstraction layer public mailbox. The hardware abstraction layer public mailbox comprises a mailbox manager and a round-robin queue storer. The hardware abstraction layer public mailbox is connected with application components and a physical bus. The mailbox manager is used for receiving data and storing the data to be sent or to be received into the round-robin queue storer. The application components are informed to receive the data or to send out data packages. According to the communication system, due to the fact that the hardware abstraction layer public mailbox is arranged, the data of all the application components on the universal processor can be received and dispatched by the adoption of logic addresses, and the problem that the number of the required logic addresses of the universal processor is large can be solved.