Abstract: In order to monitor the increasing cyanide contamination in soil, and in response to the increasing monitoring tasks and the large number of monitoring samples, the actual soil samples and certified reference samples were analyzed by continuous flow spectrophotometry. The detection limit, accuracy and recoveries of the method were measured, and suitable experimental conditions and instrument parameters were found. The results were compared with those of traditional spectrophotometer, showed that the actual samples measured by the continuous flow spectrophotometry were not much different from the spectrophotometer ones, and the detection limit was 0.01 mg·kg^-1 by multiple parallel measurements in a blank laboratory, the detection limit was 0.04 mg·kg^-1, and the standard deviation and relative standard deviation were 1.437%-8.789% and 0.283%-1.520%, respectively. The recoveries of soil samples were from 94.2% to 105.0%. The results of the study on continuous flow spectrophotometry for the determination of cyanide in farmland soils showed that the method was of high precision and accuracy with lower detection limits and higher stability and reproducibility in accuracy experiments, because of its automatic sampling and testing process, it can monitor a large number of samples in a short time, and the analysis efficiency is high and the degree of automation is spectrophotometer, it has a broad prospect in practical application.