Patch tool

The surface mounting tool provided by the utility model comprises a connecting assembly, a tube shell fixing assembly, a limiting component and a marking block, the tube shell fixing assembly comprises a fixing base, a first limiting piece and a second limiting piece, the tube shell is arranged on the surface of the fixing base, and the tube shell is avoided through a first limiting groove in the surface of the first limiting piece and a second limiting groove in the surface of the second limiting piece, so that the tube shell is exposed relative to the surface of the second limiting piece; meanwhile, the position of the tube shell is fixed through the first limiting groove and the second limiting groove; the limiting part is arranged on the surface of the first limiting piece, is exposed relative to the surface of the second limiting piece through a third limiting groove in the surface of the second limiting piece and is connected with the side wall of the tube shell; a marking block is arranged on the surfa