The invention discloses a preparation method of a black titanium dioxide visible light catalysis coating. The preparation method comprises the steps that organic matter, surfactants, titanium dioxidenanoparticles and solvents are mixed to prepare spraying raw material suspension liquid; the spraying raw material suspension liquid is deposited to the surface of a base body through a plasma spraying technology, and thus the black titanium dioxide visible light catalysis coating is obtained; the organic matter is selected from polyvinyl pyrrolidone and/or polyacrylamide; and the mass ratio of the organic matter to the titanium dioxide nanoparticles is 1:(1-10). According to the preparation method, the organic matter is added into spraying raw materials, the mass ratio of the organic matter to the titanium dioxide nanoparticles and spraying process parameters are accurately controlled, thus the black titanium dioxide coating is obtained through a thermal spraying process for the first time, the preparing process is easy and controllable, and the risk and the cost are low.