The invention relates to a method and a device for speed restriction of forwarding of a multi-core network. The method is applied to any core in the multi-core network. The method comprises the following steps of obtaining an initial time threshold; when a target time threshold reaches, obtaining a total traffic value of the multi-core network within the target time threshold, wherein the initial target time threshold is the initial time threshold; and when the total traffic value reaches a maximum allowable traffic value within a preset multi-core network unit time, discarding subsequently-received messages. Through the technical scheme, when the target time threshold reaches, the total traffic value of the multi-core network within the target time threshold is obtained, as for calculation of the network forwarding traffic value, the statistic is carried out on the total traffic value based on the time point other than package by package, so that the influence of a statistical function under the multi-core on the performance can be reduced. Through the scheme, the software calculation amount can be minimized and the calculation cost can be reduced, so that the performance cost of speed restriction of forwarding of the multi-core network is reduced.