▎ 摘　　要

NOVELTY - The electrode has a laser-induced graphene (LIG) electrode whose surface is formed with a tin film comprising metal tin, where the tin film is formed by immersing the LIG electrode in tin solution. A surface of the metal tin is formed with a tin dioxide metal oxide film, where thickness of the tin film is measured as 50nm to 1 microns. The LIG electrode is formed with a polyimide film as a substrate. USE - Working electrode for a cadmium ion electrochemical sensor. ADVANTAGE - The electrode has better anti-interference ability, reproducibility and detection stability and accuracy. The electrode can be made similar to a product in a form of test strip, so that the electrode is convenient for detecting standardization. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for the followings: (1) a cadmium ion electrochemical sensor working electrode manufacturing method; (2) a method for detecting content of cadmium ion in water environment; and (3) a working electrode utilizing method. DESCRIPTION OF DRAWING(S) - The drawing shows a sectional view of a working electrode.