The invention relates to a compact suspended microstrip high-isolation multi-power combiner. The compact suspended microstrip high-isolation multi-power combiner is composed of a suspended microstrippower dividing/combining circuit, a microstrip or suspended microstrip isolation circuit and connection coaxial cables; the suspended microstrip power dividing/combining circuit is composed of input ports, an output port, a dielectric substrate, metal microstrips, an upper grounding metal plate and a lower grounding metal plate; the isolation circuit adopts star connection, and an isolation resistor is installed on the isolation circuit; the suspended microstrip power dividing circuit achieves power allocation and input/output impedance matching; and the isolation circuit achieves good outputVSWR and isolation among the ports. The compact suspended microstrip high-isolation multi-power combiner has the advantages of being low in insertion loss, good in input/output echo, high in power capacity and isolation, wide in bandwidth, small in circuit size and the like, can be applied into various high-power microwave and millimeter wave systems and has the wide application prospect in systems of communication, radar, measurement and control and the like.