Combined tower foundation

The utility model relates to a combined tower foundation. The combined tower foundation is characterized by comprising four detachable and spliced foundation blocks (1), wherein each foundation block (1) is composed of a base plate and a bearing block (3) raised on the base plate (2), the bearing blocks (3) on two opposite foundation blocks (1) in one direction retract towards the other end along a spliced end, and correspondingly the bearing blocks (3) on two foundation blocks (1) in the other direction stretch out towards the direction of the spliced end in a cantilever mode; and each foundation block (1) is provided with a longitudinal through hole (4) which is used for being provided with a connecting piece in penetrating way so as to connect the two foundation blocks (1) spliced in one direction, and the heights of the longitudinal through holes (4) in the foundation blocks (1) in the two directions far away from the base plate (2) are different, and horizontal through holes (5) used for enabling connect