▎ 摘　　要

NOVELTY - The method involves preparing a poly-dopamine-graphene oxide coated optical fiber grating. An end of the optical fiber grating is connected with a broadband light source. A grating area portion of the optical fiber grating is coated with poly-dopamine-graphene oxide. The poly-dopamine-graphene oxide is placed in a V-shaped groove container. Another end of the optical fiber grating is connected with a high resolution spectrum analyzer. A heavy metal ion dispersion is dropped into the V-shaped groove container. A spectrum detection of the heavy metal ion is realized. USE - Method for detecting poly-dopamine-graphene oxide coated optical fiber grating heavy metal ion. ADVANTAGE - The method enables realizing poly-dopamine-graphene oxide coated optical fiber grating heavy metal ion detecting process in a simple and convenient manner with wide range of applications and high practicability, and reducing detecting cost.