The invention discloses a traffic load sharing method for a delay-tolerant heterogeneous wireless mobile network, comprising the following steps: step 1, constructing an access point AP deployment diagram of a random geometry model in a specific area; step 2, determining the state transition probability of discrete time for a user in the specific area according to the AP deployment diagram constructed in step 1; step 3, determining a probability distribution function of the distance between the user and an AP communicating with the user; step 4, determining the coverage rate of the AP; and step 5, determining a data traffic function of shared load expected by the user in a certain period of time according to the results obtained in step 2, step 3 and step 4. By adopting the method of the invention, the prediction accuracy of load-shared traffic can be improved, and the traffic load sharing efficiency of WIFI can be improved.