The invention relates to an oil-field layered liquid-injecting device. According to the technical scheme of the oil-field layered liquid-injecting device, an upper connector and a lower connector are connected through a central pipe, a moving body is formed by a sealing plunger, a constant-pressure switch, a uniflow slide body, a swivel pressing cap and a swivel, and the constant-pressure switch is arranged between the sealing plunger and the central pipe; the uniflow slide body is connected with the lower portion of the constant-pressure switch, the lower portion of the uniflow slide body is the swivel, and the upper portion of the swivel is connected through the swivel pressing cap; the swivel rotates around the central pipe, an energy-storing mechanism is arranged on the lower portion of the moving body, and an energy-storing pad is connected with the bottom of the energy-storing mechanism; and a pressure regulating ring is connected with the lower portion of the energy-storing pad, the pressure regulating ring is connected with a sealing cylinder sleeve through a positioning dowel, and a track is arranged on the inner portion of the middle of the central pipe. The oil-field layered liquid-injecting device has the beneficial effects that the technology is simple, a plurality of layers of tubular columns are not needed to be put downhole, separating injection is clear, people can press from top to bottom, and the multiple layers of tubular columns descend to a needed water-injecting layer to achieve multi-layer connecting water-injection; and the underground water-injecting operation can be adjusted and can be closed to achieve separated layer water-injection, and meanwhile, commingled injection can be achieved.