The invention provides a cloud-side-end cooperative unloading method and system based on an assembly line and relates to the technical field of mobile edge computing. Tasks are allocated through the pipeline unloading strategy, and communication resources transmitted between a mobile device and an edge node and between the edge node and a cloud center by the time delay sensitive tasks can be effectively reduced, so that transmission time of the time delay sensitive tasks among the mobile device, the edge node and the cloud center is shortened, and the purpose of reducing time delay is achieved. Meanwhile, on the basis of the cloud side cooperative unloading architecture of the assembly line, an assembly line unloading strategy, computing resources and communication resources are jointly considered, the problem of minimizing the total waiting time delay of all mobile devices is proposed, tasks can be computed at the local of the mobile devices, MEC servers of edge nodes and a cloud endat the same time, and the efficiency of the system is improved. System time delay is reduced, and the requirement of a time delay sensitive task on timeliness is met.