The invention relates to the field of nano semiconductor photocatalytic materials and aims to provide an Ag3PO4 nanowire/AAO nano semiconductor compound photocatalytic material and a preparation method thereof. The preparation method comprises the following steps: adding an AAO template into a container; and then adding an Ag<+> solution and a PO4<3-> solution into the container. The prepared Ag3PO4/AAO has a unique shape and a good photocatalytic performance, and is simple in preparation process, short in reaction time, environment-friendly in process, good in repeatability and easy for industrial production.