Special label applicator for joint sealant, specially designed for single and double tube cylindrical containers of joint sealant, true ceramic glue, and epoxy colored sand. It is compatible with all regular specifications of joint sealant, true ceramic glue, and epoxy colored sand tubes for label application. The equipment is compatible with various self-adhesive labels and supports single-sided and double-sided label application. It can precisely complete the circular label application on the tube body, perfectly solving common industry problems such as bubble formation, wrinkling, skewing, label offset, and uneven height of joint sealant tube labels.