The utility model is used for well drilling and well completion operation in petroleum industry. The structure characters of the tool of the utility model are that the end of the chassis is connected with a tail pipe column of a lower branch borehole well completion, a whipstock is set with the tail pipe in the lower branch borehole well completion, the upper end of the chassis as the support of the whipstock is provided with special inside spline,when side track of an upper branch borehole is required, the whipstock can be inserted angularly, the lower end of the directional inserting spindle of the whipstock is provided with special spline structure matching the upper end of the chassis, thereby making the whipstock inserted the chassis favorably after being oriented. The tool of the utility model employs a reclamation projection that reclamation holes which are preset in the whipstock are combined with elastic pins of a reclamation tool. The utility model employs the chassis connected with the lower tail pipe and the spline structure of the whipstock to realize the location of the upper whipstock, which not only does not need to use expensive device to locate in the process of lower borehole completion operation, but also achieves reliable and easy operation, low cost and small risk.