External glue injection device

The utility model relates to an external glue injection device. A glue melting assembly heats glue and enables the glue to be in a molten state. The glue melting assembly provides molten glue for the connecting pipe through the glue outlet. The connecting pipe conveys the melt glue to the gluing assembly, and the gluing assembly smears the glue on a target object such as a book block. The heating assembly heats the glue in the connecting pipe through the heating hole, and the fluidity and viscosity of the glue are kept. The heated glue flows through the connecting pipe to reach the gluing assembly and is smoothly smeared on a target object. And the heating assembly is used for heating the glue in the connecting pipe, so that the fluidity of the glue can be kept, and the glue can keep proper viscosity in the glue injection process. The proper glue viscosity can ensure smooth flowing of the glue, and the glue is uniformly smeared on the gluing assembly, so that a good glue covering effect is achieved. Due to th