The invention provides a variable-focus super lens based on polymer network liquid crystal and a preparation method. The variable-focus super lens comprises a first substrate layer, a super-lens layer, a polymer network liquid crystal layer and a second substrate layer which are sequentially arranged in the direction of an incident light path, wherein the first substrate layer comprises a first base and a first conductive layer located on a side face, facing the second substrate layer, of the first base, the super-lens layer comprises a plurality of nano resonance units which are periodicallydistributed according to a sequence, the super-lens layer is formed on the first conductive layer, the polymer network liquid crystal layer comprises polymer network liquid crystal filled between thesuper-lens layer and the second substrate layer, the second substrate layer comprises a second base, a second conductive layer located on a side face, facing the first substrate layer, of the second base, and a liquid crystal alignment layer formed on the second conductive layer. Based on combination of the liquid crystal material and a super lens, the function of the variable-focus super lens isrealized, and the application range of the super lens is expanded.