The invention discloses a method for synthesizing a porous SnO2 nano-wire harness, relates to a preparation method for a nano-wire harness, and mainly solves the problems of complex process, high organic raw material cost, expensive equipment and industrial production limitation caused by high reaction temperature in the conventional preparation method. The method for synthesizing the porous SnO2nano-wire harness comprises the following steps of: firstly, uniformly mixing absolute ethanol and polyethylene glycol 600; secondly, adding SnCl2.2H2O into the mixed solution; thirdly, centrifuging to obtain precipitate; fourthly, performing centrifugal washing on the precipitate with deionized water; fifthly, performing centrifugal washing on the precipitate with the absolute ethanol; and finally, drying and annealing to obtain the porous SnO2 nano-wire harness. The method has mild reaction conditions, can perform reaction at a normal temperature and normal pressure without heating, has lowrequirement on reaction equipment, saves energy source and does not generate harmful substances in a reaction process. The method has a simple process, easily obtained raw materials, low cost, environment friendliness, and broad application prospect in a semiconductor material field, and is safe and convenient to operate.