The invention discloses an input translator with multiple power sources and an uninterruptible power supply system with the input translator. In the input translator, each input power source is provided with an energy-storage inductance and an alternating-current switch circuit and subsequently connected with two energy-storage capacitors; when alternating current power supply is input, the flow direction of input current can be controlled by the control on the connection or disconnection of the alternating-current switch circuit so as to fulfill the functions of full-wave rectification and high power factor correction; when direct current power supply is input, the transfer mode from direct current to direct current power supply is realized also by the control on the connection or disconnection of the alternating-current switch circuit. Therefore, independently based on the condition of corresponding input power supply, each alternating-current switch circuit realizes the function oftransfer from alternating current to direct current and from direct current to direct current while maintaining the normal power supply to the energy-storage capacitor.