A kind of high integrated multifunctional sum-difference network which works in the millimeter wave band is presented. In the sum-difference network, a passive sum-difference network, dividers, active receivers, active transmitters, RF switches and a control circuit are integrated. Compared with the conventional RF sum-difference network, this highly integrated design proves to have much less volume and weight. As shown in the experiment measurement, the ports are well matched, and good RF performances are observed within highly reduced design.