The invention discloses a frequency spectrum aggregation method based on business delay demands, and relates to the technical field of wireless communication. According to the frequency spectrum aggregation method based on the business delay demands, by searching available discrete frequency bands in the space, and the optimal aggregation frequency band is selected for a user in an aggregation span range, wherein frequency spectrum is to be allocated to the user. According to the frequency spectrum aggregation method based on the business delay demands, packet-loss emergency degree of the user is fully considered, the frequency spectrum is optimally selected by combining the packet-loss emergency degree of the user with frequency spectrum survival time, package loss ratio of the user is minimized, time utilization rate of the frequency spectrum is improved at the same time, frequency spectrum switching of the user is reduced, users are accommodated as more as possible, and therefore frequency spectrum waste is avoided, and frequency spectrum efficiency is improved.