Cache management has become a research hotspot in opportunistic networks. At present

most cache management methods are concentrated on single node. In this paper

we propose a cache sharing resource scheduling method for collaborative groups under the background of campus collaborative learning. Node activity describes the cache space utilization of mobile nodes and the enthusiasm of nodes to participate in message forwarding. Message tree describes the degree of message diffusion in the network. A linked list of delivered messages is established based on the collaboration group

and the cache space occupied by the successfully delivered messages is released in time. This method can effectively improve the node space utilization and message delivery rate

and reduce the message delivery delay. The experimental results show that

compared with the existing algorithms

the success rate of message delivery is increased by 10.53% on average

which provides a method for the sharing and utilization of group cache and the efficient scheduling of resources.