A multiport connector and a power control method are provided. The multiport connector comprises a power output port and multiple power input ports. The power output port is connected to an electronic device. The power input ports are connected to multiple power adapters to form multiple power transmission paths. Each power transmission path comprises a power line, a detecting circuit and an impedance component connected to the detecting circuit in series. Therefore, when the electronic device is connected to the multiport connector, the electronic device detects the equivalent impedance formed by the impedance components on the detecting circuits to adjust an upper limit of load power.