Communication resource allocation method and system based on service priority

The invention discloses a communication resource allocation method and system based on service priority, and the method comprises the steps: after a high-priority service is generated, when no communication resource is reserved or communication resource collision occurs, the high-priority service preempts the communication resource of a low-priority service for transmission, and the transmission of the low-priority service is stopped; and gradually releasing communication resources preempted by the high-priority service according to the priority degree, the service volume and the data packet sending interval of the high-priority service and the low-priority service, and recovering the sending of the low-priority service until the high-priority service is sent completely or the communication resources are sufficient. The invention not only improves the reliability of the high-priority service, but also avoids the problem that the low-priority service triggers resource reselection and generates resource collisi