The invention relates to a circular rigidity safety compensation facility for a pile casing of a deep water bored pile and a construction method thereof. The compensation facility comprises a pile casing of a deep water bored pile for surrounding the deep water bored pile and a circular rigidity compensation mechanism of the pile casing arranged on the inner wall of the pile casing of the deep water bored pile; the circular rigidity compensation mechanism of the pile casing comprises a plurality of rigid tracks vertically arranged on the inner wall of the pile casing of the deep water bored pile, a circular lining rigid gasket structure of the pile casing arranged on the rigid tracks and located in a circular direction of the pile casing of the deep water bored pile and a lifting device connected with the circular lining rigid gasket structure of the pile casing; the lifting device is arranged on the top or outer side of the pile casing of the deep water bored pile. The technical scheme provided by the invention can prevent drilling instable accidents caused by the coupling of the deep water and poor geological conditions so as to ensure the construction safety of deep water pile foundation.