The utility model discloses a tower crane foundation in a building basement. The tower crane foundation is made of a cross-beam plate reinforced concrete and consist of a cross beam (1) and a plate (2), wherein the cross beam (1) and the plate (2) are casted and connected into one body; at least a circle of eliminator (3) is embedded and fixed around the plate (2) of the tower crane foundation, the other end of the eliminator (3) is inserted and connected into a bottom plate (6) of the basement around the plate (2) of the tower crane foundation, and the surface of the plate (2) of the tower crane foundation is level with that of the bottom plate (6) of the basement. The utility model has the advantages of fast, convenient and efficient construction, low construction cost and running cost, reliable performance and the like, runs safely and is easy to operate.