Five-level multilateral well seal tool

The invention relates to multilateral well completion tool, in particular to a five-level multilateral well seal tool. A main borehole pre-reserved hole pipe side wall of the tool is provided with a branch hole. A lower connector is connected to the lower end of the main borehole pre-reserved hole pipe. An arc hollow deflector is mounted in the main borehole pre-reserved hole pipe. A multilateral well pre-reserved hole inserting tool is inserted into the main borehole pre-reserved hole pipe. An upper connector is connected to the upper end of the multilateral well pre-reserved hole inserting tool. An axial ditch and an annular ditch are machined on the outer wall where the multilateral well pre-reserved hole inserting tool is closely matched with the main borehole pre-reserved hole pipe. Seal rubber is vulcanized in the axial ditch and the annular ditch. An arc notch is obliquely machined on the upper end side pipe wall of the arc hollow deflector, and the arc pipe wall face at the notch is closely matched with the pipe wall oblique face of the multilateral well pre-reserved hole inserting tool. By the multilateral well completion tool, hydraulic seal can be performed at a multilateral well window, and mechanical connection can be provided for multilateral well borehole tubular piles.