The invention provides a mirror surface skidding and earthquake isolating support saddle for buildings, relating to a novel earthquake proof support saddle, suitable for existing buildings and new buildings, especially for reinforcing the schoolhouses in middle schools and primary schools. The support saddle, from top to down, orderly comprises an upper connecting plate (1), an upper sliding plate seat (2), elastic materials (3), an upper sliding flat plate (4), sliding materials (5), a lower sliding flat (6), a base layer (7), a lower sliding flat seat (8) and a lower connecting plate (9) toform an earthquake isolating device of the building, wherein the elastic materials (3) are embedded in the lower part of the upper sliding plate seat (2); and the lower sliding flat (6) is embedded into the upper part of the lower sliding flat seat (8). The support saddle overcomes the disadvantages of the prior art; the frictional factor of the skidding and earthquake isolating device is small; the earthquake isolating effect is perfect; the safety is high; after using an earthquake isolating technology, the construction is performed at the layer of the primary building, which has little damage to the primary building, and has little influence.