The utility model discloses a be used for supplementary oil drill pipe connecting device, including the mounting panel, a pair of slide rail of installation on the mounting panel, fixed a pair of mounting box on the mounting panel, the horizontal scale of installation in the mounting box, be equipped with the fly leaf on the mounting panel, be equipped with the support column on the fly leaf, first sleeve pipe of installation and second sleeve pipe on the support column, first activity pipe of difference cartridge and second activity pipe in first sleeve pipe and the second sleeve pipe, firstbogie of installation and second bogie on the support column, install first pneumatic cylinder and second pneumatic cylinder in first bogie and the second bogie respectively. The utility model discloses can assist the drilling rod to connect, prevent that the connection from not just the screw thread appearing to cause the loss to influence the project progress, reduced staff's working strength moreover, improve work efficiency.