The invention discloses a copper-7, 7, 8, 8-tetracyanoquinodimethane material and a preparation method and an application thereof. The method comprises the following steps: in an inert atmosphere, dissolving -7, 7, 8, 8-tetracyanoquinodimethane in acetonitrile; and then, adding cuprous iodide, and carrying out a reaction under reflux to obtain the material. The material prepared by the invention can be used for preparing organic thermoelectric materials. Through verification, the thermoelectricity of the copper-7, 7, 8, 8-tetracyanoquinodimethane doped by 2, 3, 5, 6-tetrafloro-7, 7', 8, 8'-tetracyanodimethyl p-benzoquinone is remarkably improved, for instance, when the dosage concentration of 2, 3, 5, 6-tetrafloro-7, 7', 8, 8'-tetracyanodimethyl p-benzoquinone under 360K is 1mol%, the power factor is improved from 1.4 mu W / mK<2> to 2.2 mu W / mK<2>. Meanwhile, the preparation method provided by the invention is simple in process, easy in preparation and low in cost.