Extensible grouting type anchoring foundation and construction method thereof

The invention discloses an extensible grouting type anchoring foundation and a construction method thereof. The extensible grouting type anchoring foundation comprises a grouting body, an upper steelframe and a lower steel frame, wherein the upper steel frame comprises a plurality of first steel bars, a plurality of steel tubes, a first fixing ring, an annular end, a circular ring tube and a connecting tube. The circular ring tube and a plurality of steel tubes form an internally communicated grouting channel, one side of each of a plurality of steel tubes is provided with a plurality of grouting holes which are sequentially distributed from top to bottom, and the lower steel frame comprises a plurality of second steel bars, a second fixing ring and an anchor head; after the upper steel frame and the lower steel frame are assembled in a matched mode, back stretching and opposite contracting movement can be conducted, and the grouting body wraps the upper steel frame and the lower steel frame in case of the ma