The invention discloses a method for preparing a graphite phase carbon nitride nanosheet/titania nanotube array photocatalysis material. The method comprises the following steps: step one, thermally condensing melamine to prepare graphite phase carbon nitride powder; step two, ultrasonically peeling bulk graphite phase carbon nitride to obtain a graphite phase carbon nitride nanosheet; step three, adding the carbon nitride nanosheet to electrolyte, and synthesizing graphite phase carbon nitride nanosheet/amorphous titania nanotube array by one step during anodic oxidation; step four, conducting heat treatment on a sample obtained by anodic oxidation to prepare a graphite phase carbon nitride nanosheet/titania nanotube array material. The graphite phase carbon nitride nanosheet/titania nanotube array photocatalysis material rapidly prepared by one step according to the method provided by the invention is economic and environmentally friendly; an obtained photocatalyst overcomes defects of titania nanotube array and bulk graphite phase carbon nitride, improves the utilization of visible light, reduces a recombination rate of photo-generated electron holes, and can implement the efficient photocatalytic degradation of organic pollutants under irradiation of visible light.