The invention discloses a perforating automatic liquid inlet tubular column and an operating method. The tubular column comprises a gun tail, a perforating gun, a pressure perforating delay detonator, an automatic liquid inlet valve, oil pipes and a positioning pipe nipple, wherein the gun tail, the perforating gun, the pressure perforating delay detonator and the automatic liquid inlet valve are connected in sequence from bottom to top, at least three oil pipes which are connected in sequence are arranged between the automatic liquid inlet valve and the positioning pipe nipple, and the upper end of the positioning pipe nipple is connected with an oil pipe or a drill rod. The perforating automatic liquid inlet tubular column disclosed by the invention can achieve one-way automatic liquid feeding by relying on pressure in a well during the process of lowering a perforating tubular column at an ultrahigh temperature and an ultrahigh pressure, can realize the aim of pressurized detonation in the oil pipes or the drill rod at the same time, and can also avoid well control risks in an oil pipe conveying pressure opening delay perforating tubular column at present, and once a complicated abnormal case appears at a well head, the oil-gas safety production operation can be ensured by performing well killing operation through small displacement reverse circulation.