The invention relates to the technical field of environmental and biological analysis, and in particular relates to a copper ion colorimetry detecting kit and a detecting method thereof. The kit comprises a hydrobromic acid solution, a gold nanorod solution containing cetyl trimethyl ammonium bromide (CTAB), a standard colorimetric card C and a colorimetric tube, wherein the gold nanorod solution containing the CTAB is formed by dissolving gold nanorods in a CTAB solution under the condition that the concentration of the gold nanorods is within 0.5 to 10nM and the concentration of the CTAB is with 0.01 to 100mM; and the concentration of hydrobromic acid in the hydrobromic acid solution is within 0.05 to 5.0M. The kit for detecting copper ions has the advantages of being high in sensitivity, good in selectivity, easy to operate, easy in naked-eye observation and the like. Under the debugging of a systematic experiment condition, the detection on the copper ions in environmental and biological samples can be realized.
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