The invention discloses a method of realizing a multi-standard collaborative service shunting network selection and a device thereof. The method comprises the following steps that a terminal acquires operation condition information of a current network and other networks, decision information used for determining that a service is migrated to WLAN and/or unloading time mode information; according to the acquired operation condition information of the current network and the other networks, the decision information used for determining that the service is migrated to the WLAN and/or the unloading time mode information, when the terminal needs to migrate the service from the current network to a WLAN network and the terminal is determined to satisfy a service migration condition of migrating the service from the current network to the WLAN network, service migration is performed. Through combining the operation condition information of the networks and the unloading time mode, when the terminal carries out the service migration on 3G, LTE and the WLAN, according to the above information, the service is migrated to a network which satisfies the service migration condition and has a good network resource. Effective application of the network resource is realized and a user access experience is improved.