The invention relates to an electro-deposition method for carboxymethyl cellulose. The electro-deposition method for carboxymethyl cellulose is characterized by comprising the following steps of 1) preparing a carboxymethyl cellulose electro-deposition solution; 2) metal electrode material preparation: taking metal copper or metal cobalt as an anode metal material for carboxymethyl cellulose electro-deposition, and taking a platinum sheet as a cathode metal material for carboxymethyl cellulose electro-deposition; and 3) carboxymethyl cellulose electro-deposition: simultaneously immersing an anode and a cathode into a container containing the carboxymethyl cellulose electro-deposition solution, and connecting the anode and the cathode to a direct-current power supply to electro-depositing carboxymethyl cellulose for 3-10min to obtain a carboxymethyl cellulose electro-deposition layer electro-deposited on the surface of an anode metal electrode material. By using the method, a metal electrode can be electro-deposited to form the carboxymethyl cellulose electro-deposition layer; and the method has the advantages of mild preparation condition, simplicity and convenience in operation, simplicity in control, simple instruments and equipment, environment friendliness, good repeatability and low cost.