The invention discloses a tracking support system adaptive to complex terrains. The tracking support system comprises a plurality of support units, wherein each support unit includes at least one vertical column fixedly arranged on the ground and a mounting rod arranged on the vertical column, the angle of the rotation of the mounting rod with its own axis as the axis of rotation is taken as the self-rotation angle, and the angle formed by the mounting rod and the vertical column is taken as an included angle. The tracking support system also includes an adjustment mechanism for adjusting theself-rotation angle and the included angle. The tracking support system combines a large linkage tracking technology with an adaptive angle adjustment technology, can adapt to large-angle and up-and-down mountain terrains, and can adapt to the change of the topography caused by land subsidence; the tracking support system can be widely applied to flat single-axis, oblique single-axis and large linkage tracking systems, and it is of great significance for the current construction of photovoltaic supports, particularly large linkage structures, in mountain terrains and geology-precipitable areas.