The invention provides a method and device for reducing intercell interference of a heterogeneous network. The method comprises the steps of: for a macro base station in a LTE same-frequency heterogeneous network, which adopt eICIC (Enhanced Intercell Interference Coordination), recording an identifier of an ABS (Almost Blank Subframe) sent to a terminal side by the macro base station; and according to the identifier of the ABS, carrying out regulation on a RS (Reference Signal) on the ABS sent by the macro base station, so that when the macro base station sends the ABS, the RS is only sent onN continuous RB bandwidths, wherein N is greater than or equal to 1 and smaller than an RB number corresponding to a carrier bandwidth. According to the invention, when measurement of a terminal is ensured, network interference can be reduced, and network bearing efficiency is promoted.