The invention discloses a fishing net dyeing method which comprises the steps of (1) activating solution treatment, (2) dyeing, and (3) drying. By adopting a prepared activating solution for treatinga fishing net, cationic dyes can be effectively attracted in a dyeing process and are combined to form ionic bonds so as to enhance the bonding force of the dyes; and more groups such as carboxyl groups and amino groups can be formed on the surface of the fishing net, so that the treated fishing net can be complexed with hydroxyl groups, amino groups and the like on dye molecules. By utilizing thecharacteristic, in the dyeing process of the fishing net, the adsorptivity between the dye molecules and the fishing net is greatly increased, thereby achieving the effects of increasing the dyeing rate and color fixing performance. The fishing net dyeing method disclosed by the invention can solve the problems of uneven dyeing, uneven dyeing, color difference and color defects easily caused in the dyeing process of the fishing net, increases the dye utilization ratio and the dyeing fastness, and reduces the dyeing processing risk.