The invention provides a method for preparing a visible light responsive mesoporous titanium dioxide material by using coagulated sludge. The method comprises: preparing a titanium dioxide xerogel from a hydrolysis inhibitor and a titanium source; coagulating the prepared xerogel to remove green algae; and carrying out constant temperature standing on the coagulated sludge, and rapidly heating toobtain the finished product. With the method of the present invention, green algae can be removed by coagulating the intermediate product xerogel in the catalyst preparation process, and the titaniumdioxide material can be modified by using the coagulating process, such that the material can have visible light response, the photocatalytic activity of the titanium dioxide material can be increased, the applicability of the titanium dioxide material can be enhanced, and the service life of the titanium-based material can be prolonged.