The invention discloses a logic circuit array of a secondary power supply. The logic circuit array comprises power inputs, a logic control and power outputs, wherein two groups of power inputs generate five groups of power outputs through the logic control. The logic circuit array has the beneficial effects that when the two groups of inputs exist simultaneously or only one group of inputs exist, two groups of inputs can be effectively selected and controlled to supply power to the five groups of outputs; furthermore, diodes connected in series have a polarity function, so that electricity utilization equipment cannot be damaged by protection outputs if positive and negative inputs are reversed; and therefore, functions of stabilizing output voltage and protecting the electricity utilization equipment due to reversed positive and negative polarities of the inputs are realized. According to the logic circuit array of the secondary power supply, the reliability, the multi-input flexibility and the technical index stability of the power supply are improved.