The invention discloses a primary hoisting and quick groove entering construction method for an even wall ultralong steel reinforcement cage. The construction method comprises the following steps that(1), a main crane and an auxiliary crane jointly hoist the steel reinforcement cage, eight slack pre-hanging steel wire ropes are wound around a carrying pole of the main crane, and the two ends of the pre-hanging steel wire ropes are hung on hoisting ribs of the steel reinforcement cage; (2), the weight of the vertical steel reinforcement cage is completely borne by the main crane; (3), when thesteel reinforcement cage is hoisted to the position over a groove section, the steel reinforcement cage is slowly put into the groove section by the main crane; (4), hoisting points of the auxiliarycrane are sequentially disassembled from bottom to top along with putting of the steel reinforcement cage; (5), a temporary support is installed under a lowest hoisting point of the main crane; (6), movable pulleys of the main crane are disassembled; (7), the steel reinforcement cage continues to be put down; and (8), the temporary support is installed to fix the steel reinforcement cage, and putting is completed. According to the construction method, the assembling and disassembling frequency of the temporary support is decreased, the process time is shortened, personnel and equipment input increased by steel reinforcement cage cutting when the temporary support is assembled and disassembled multiple times is avoided, and potential safety hazards are reduced.