The present disclosure provides a method, a control terminal and a system for assisting a device to access a network. The method includes: receiving auxiliary distribution network information which is used to assist a device to access the network, filling the received auxiliary distribution network information into a probe request frame, and sending the probe request frame which carries the auxiliary distribution network information in a wifi broadcast packet, so that, after monitoring the wifi broadcast packet, the device accesses a corresponding wireless router by using the auxiliary distribution network information carried by the probe request frame in the wifi broadcast packet.