The utility model discloses a connection structure of a small -size clump of piles and cushion cap. Traditional tubular pile pile head is fixed for bar planting on the board of end or with the connecting pin with the connected mode of cushion cap, and this kind of mode is connected firmly inadequately, still can influence the prestressing force effect moreover under the alternate load. The utility model discloses a prefabricated cushion cap and a plurality of prefabricated pile body, the bottom and prefabricated pile body butt joint department of prefabricated cushion cap are equipped with the reservation hole that is used for prefabricated pile body to run through, and the inner wall of prefabricated cushion cap forms the protruding portion that a plurality of intervals set up, makes and forms the recess between the adjacent protruding portion, every precast pile be equipped with the shear connector on one's body, the built -in fitting that can improve local compressive capacity is buried underground to the bottom of prefabricated cushion cap, lies in the shear connector below in prefabricated cushion cap and prefabricated pile body equipment to carried forward, built -in fitting for support the shear connector. The utility model discloses consolidate the wholeness of tubular pile and cushion cap and resist complex stress's performance and be waterproof on inner structure, improved its durability.