The invention discloses a measurement method for the anthocyanin content of a purple-leaf plum leaf, and belongs to the technical field of non-destructive measurement of crop growth information in precision agriculture. The method comprises the steps that reflection spectrum data of the purple-leaf plum leaf are measured by adopting a hyperspectral radiometer, the anthocyanin content of the leaf is measured indoors, and then the reflection spectrum data of the purple-leaf plum leaf and the anthocyanin content data are fused; a sensitive wavelength of anthocyanin is determined through relative analysis, and an anthocyanin content spectrum monitoring model based on a characteristic wavelength is built; reflection spectrum data of a purple-leaf plum leaf to be measured in the characteristic wavelength are measured by adopting a spectral radiometer, the data are substituted into the anthocyanin content spectrum monitoring model, and the anthocyanin content of the purple-leaf plum leaf is calculated and obtained. The method is simple, efficient, practical, high in precision, capable of achieving non-destructive measurement on the leaf and suitable for in-situ repeated measuring of samples of different tree ages and different colors and large-area measuring.