The present invention relates to a method for transmitting channel information to a base station in a wireless communication system, and a device therefor, the method comprising the steps of: receiving information on a user equipment (UE) group in which a specific UE is included; receiving, from a representative UE of the UE group, first control information comprising first beam information; determining second beam information on the basis of the first beam information; and transmitting, to a base station, second control information comprising differential information between the determined second beam information and the first beam information.