▎ 摘　　要

NOVELTY - A device comprises a reaction cavity, and a double-negative electrode reaction film arranged in the reaction cavity. The double-negative electrode reaction film comprises a negative electrode plate (P1), a positive electrode plate and a negative electrode plate (P2) arranged in the reaction cavity from up to down. The reaction cavity is provided with a negative electrode cavity (C1), a positive electrode chamber (C2), and a negative electrode cavity (C2) arranged from top to bottom and separated from negative electrode plate (P1), positive electrode plate, and negative electrode plate (P2). A water inlet is connected with the negative electrode cavity (C1) and a water outlet is connected with the negative electrode cavity (C2). USE - Device is used for preparing electrocatalysis double-negative electrode reaction film used in water treatment (all claimed). ADVANTAGE - The device can generate two reactants required by the electric Fenton reaction internally without adding additional oxidant, and can be used in a closed environment terminal, not only suitable for large sewage treatment plants, but also can be directly installed as a miniaturized terminal product at the user end as water purification equipment. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of an electrocatalysis double-negative electrode reaction film, which involves preparing raw materials into a negative electrode substrate (S1), a negative electrode substrate (S2) and a positive electrode substrate matched with the shape of the inner cavity of the reaction cavity, pre-processing the negative electrode substrate (S1), the negative electrode substrate (S2), and positive electrode substrate, and depositing a negative electrode graphene layer sheet (G1), a negative electrode graphene layer (G2), and a positive electrode graphene layer on the pre-processed negative electrode substrate (S1), the negative electrode substrate (S2), and the positive electrode substrate.