An embodiment of the invention provides a device and a method for treating 
refractory wastewater by 
coupling an electrocatalytic membrane with a three-dimensional 
electrode. The device mainly comprises a Ti4O7 / Ti 
filter element anode, a water-permeable separation mesh, a 
graphite felt 
cathode, C@Fe3O4 particles, an 
aeration pipe and a current-stabilized and 
voltage-stabilized power supply; and the device is in the shape of a cylinder on the whole, the Ti4O7 / Ti 
filter element anode is fixed at the center of the bottom of the device and a layer of water-permeable separation mesh wraps the surface of the 
anode, the 
graphite felt 
cathode clings to the inner wall of the cylinder, the 
aeration pipe is placed at the bottom of the device and beside the 
graphite felt 
cathode, the C@Fe3O4 particles fill the space between the water-permeable separation mesh and the graphite felt cathode to form the three-dimensional 
electrode, the graphite felt cathode and the Ti4O7 / Ti 
filter element anode are connected with a negative 
electrode and a positive electrode of the current-stabilized and 
voltage-stabilized power supply, respectively, and 
organic matter in the 
wastewater is degraded by a constant-current 
operation mode. In the device and the method provided by the invention, the Ti4O7 / Ti filter element anode is coupled with the C@Fe3O4 three-dimensional electrode 
system to enhance the 
treatment effect on 
refractory pollutants, and through the synergistic effect of the cathode and the anode, the efficiency of the 
system for oxidizing pollutants is improved, and the 
energy consumption for 
wastewater treatment is reduced.