The invention relates to the technical field of constructional engineering, in particular to a deep pile casing mechanical pore-forming pile-forming construction process which sequentially comprises the following steps: 1, pile position setting out is conducted, specifically, the position of a foundation pile on a construction site is determined according to a design position; 2, pile casing construction is conducted, specifically, a steel pile casing with the inner diameter larger than the designed diameter of the foundation pile is selected, vibration sinking is conducted on the pile casing,the pile casing is inserted into a soil body at the position of the foundation pile, and the pile casing and the designed position of the foundation pile are coaxially arranged; 3, hole forming is conducted, specifically, the soil body in the pile casing is excavated or drilled to the designed depth of the foundation pile; 4, a reinforcement cage is hoisted, specifically, the reinforcement cage of the foundation pile is hoisted into the pile casing; and 5, concrete is poured, specifically, the concrete is poured into the pile casing to form the foundation pile. According to the deep pile casing mechanical pore-forming pile-forming construction process, the hole-forming efficiency is improved, the safety risk caused by soil body collapse is reduced, and the structural strength and rigidityof the foundation pile are greatly improved.