The invention relates to a three-dimensional electric air floatation water treatment device which includes a cylinder body, an oil and pollutant collecting chamber, a separation plate, a flow guide plate, a primary three-dimensional electrode, a secondary three-dimensional electrode, a control device and a plurality of pipeline ports. The separation plate and the flow guide plate are disposed in the cylinder body. The oil and pollutant collecting chamber is arranged in an upper part of the cylinder body. The primary three-dimensional electrode and the secondary three-dimensional electrode are respectively at two sides of the separation plate in the cylinder body to form a primary three-dimensional electrode chamber and a secondary three-dimensional electrode chamber. The primary three-dimensional electrode and the secondary three-dimensional electrode include a plate-type anode and a plate-type cathode prepared from titanium-based oxides, wherein a granular electrode is disposed between the anode and the cathode. The granular electrode is immobilized by a porous board to form the primary three-dimensional electrode and the secondary three-dimensional electrode. The device is simple in structure, is increased in reaction area, achieves effective sterilization, is small in occupied area, is improved in mass transfer effect and current conductive efficiency and has a large reaction active area.