Sealant coating tool

The utility model relates to the technical field of coating, in particular to a sealant coating tool which is used for sealant coating and constructing processes. The sealant coating tool comprises a cylindrical feeding mechanism, wherein the front end of the feeding mechanism is statically communicated with a gun nozzle for dispensing sealant, a sealant outlet of the gun nozzle is in the shape of a flat rectangle, and a positioning mechanism is sleeved outside the cylindrical feeding mechanism. The sealant coating tool is positioned by attaching the positioning mechanism capable of rotating 360 degrees onto a metal plate on the outer side of a portion required to be sealed, and accordingly quality of sealant lines is improved effectively, labor cost and material cost are reduced, labor time is saved and labor intensity of workers is decreased. In addition, the sealant coating tool is simple in structure and low in cost and has popularization necessity and realistic possibility.