The invention discloses a multipath routing method in delay-tolerant networks (DTN). Current single path routing protocol link resource utilization is low. The method of the invention can solve the above problem. The method comprises the following steps: (1) according to a motion trail of a star in an ephemeris, constructing an original communication sequence chart of a link in a link communication period T of a deep space communication network; (2) according to a communication time segment of the link in the communication sequence chart, finding out all available paths from a star source terminal to a destination; (3) respectively calculating throughput of the all available paths in the period T and an effective transmission time quantum of the link; (4) selecting the path possessing the largest throughput; (5) correcting the communication sequence of every hop link of the selected path so as to obtain the corrective link communication sequence chart; (6) repeating from a step (2) to the step (5) till there is no available path in the link communication sequence chart. By using the method of the invention, the network throughput and a link utilization rate can be substantially raised; unfavorable influence of link discontinuity communication on data transmission can be reduced. The method can be used in the deep space communication network.