The invention relates to a preparation method of a partially alloyed anoxic tin oxide supercapacitor positive electrode material, and belongs to the technical field of new energy material preparationand application thereof. The positive electrode material provided by the invention is composed of partially Sn-Ni alloyed anoxic nano-porous particle tin oxide embedded in the foamed nickel, can be directly used as a working electrode of a supercapacitor, is high in active substance loading capacity, good in conductivity, very high in specific capacitance, good in cycling stability and is non-toxic and harmless to human bodies. The method comprises the following steps of taking the stannic oxide as a raw material and the foamed nickel as a current collector, firstly pouring the stannic oxide slurry in the foamed nickel, then drying a sample in a drying box, and then carrying out high-temperature heat treatment in a vacuum tube furnace in a reducing atmosphere to finally obtain the positiveelectrode material. The positive electrode material obtained by the method is controllable in composition and morphology, are very simple in raw materials, equipment and technological processes, veryhigh in product yield, very low in cost and safe and environment-friendly in production process, and is suitable for the large-scale production.