The invention belongs to the field of biological detection, and particularly relates to a primer group, a kit and a method for on-site rapid constant-temperature visualization and fluorescence detection of a cucumber green mottle mosaic virus. The primer group comprises an outer primer CGMMV-OF as shown in SEQ ID NO.1, an outer primer CGMMV-OB as shown in SEQ ID NO.2, an inner primer CGMMV-IF as shown in SEQ ID NO.3, an inner primer CGMMV-IB as shown in SEQ ID NO.4, a loop primer CGMMV-LF as shown in SEQ ID NO.5 and a loop primer CGMMV-LB as shown in SEQ ID NO.6. The primer group can be used for identifying the cucumber green mottle mosaic virus or detecting whether the cucumber green mottle mosaic virus exists in samples such as plant leaves, seeds, plants, nursery stocks, soil, field wastes and plant products (such as melons and fruits) or not. The detection method disclosed by the invention has the characteristics of simplicity in operation, rapidness, accuracy, good specificity, high sensitivity and result visualization, and is suitable for field and large-scale popularization and application.