Side binding device of binding machine

The invention relates to a side binding device of a binding machine. The side binding device of the binding machine comprises a side binding device body and a gear shaft installed at the upper end of the side binding device body, wherein a chain wheel is installed in the position, at the outer end of the side binding device body, of the gear shaft and used for driving the gear shaft to rotate; the chain wheel is rotatably connected with the gear shaft through a first chain; a plurality of drive gear components are arranged at the lower end of the gear shaft; the first chain drives a second chain to be in rotatable connection with the first chain through the drive gear components; a gear pump is arranged at the bottom of the side binding device body; the second chain is in rotatable connection with the gear pump and drives the gear pump to rotate; a glue pot is arranged on the upper portion of the side binding device body; and the glue pot is connected with the gear pump through a corrugated pipe. The side bin