▎ 摘　　要

NOVELTY - This utility model claims a kind of at the same time. The electrochemical immune sensor is a kind of lung cancer marker. The poly (p-phthalic acid diethyl ester (PET) substrate in printing conductive carbon ink made of counter electrode and a working electrode, printing silver/silver chloride ink. preparing reference electrode to obtain the double-channel silk screen printing electrode. Mercapto group is provided with graphene layer on the surface of the working electrode, cytokeratin 19 fragment antibody layer and carcinoembryonic antigen antibody layer to obtain the dual channel electrochemical immune sensor. The sensor cost is low, the detection result is stable, the operation is convenient, suitable for measuring the cytokeratin 19 fragment and fast at the same time of carcinoembryonic antigen.