The invention belongs to the technical field of diode manufacturing, and specifically discloses a gluing device for the leads of diodes. The gluing device comprises a fixed frame, a charge port, a glue water box module, a belt, a belt wheel, a gluing head module, a tray module and a blowing-drying module, wherein the glue water box module is fixedly installed on the fixed frame; the glue water boxmodule is used for holding a glue solution; the belt is located below the glue water box module, and sleeves the belt wheel; the belt wheel is installed on a motor shaft; the gluing head module is used for gluing the leads of the diodes; the tray module is installed on the belt; and the blowing-drying module is installed on the lower surface of the glue water box module, and located at the rightside of the gluing head module. The gluing device disclosed by the invention is mainly used for carrying out batch continuous gluing for the diodes, so that the gluing efficiency for the diodes is increased, and the market use needs are met; and meanwhile, the problem that the glue solution in the glue water box is solidified during gluing for the diodes, and inconvenient to clean in the later period, is avoided.