The utility model discloses a high-pressure shunting water distributor, comprising: an upper joint externally connected with the upper end of a centre tube, and a supporting sleeve externally connected with the lower end of the centre tube, wherein a water injection channel is formed between the upper end of the supporting sleeve and the centre tube, and a water distribution hole communicated with the water injection channel is drilled in the centre tube; a sliding sleeve is penetratively arranged inside the centre tube and is in sealed connection to the wall of an inner tube of the centre tube, which is provided with the water distribution hole, through a shear pin, and an insertion tube is arranged on an upper end seat of the sliding sleeve; a jacket is sleeved outside the centre tube, and the both ends of the jacket are respectively connected with the supporting sleeve and the upper joint; an annular channel is formed between the jacket and the centre tube; a water injection hole is drilled at a place on the jacket, which is close to the supporting sleeve, and the water injection hole is communicated with the water injection channel by the annular channel; a backflushing valve is arranged in the annular channel, an elastic element is clamped between the backflushing valve and the upper joint, and the backflushing valve is hermetically clamped into the water injection channel by the elastic element. The high-pressure shunting water distributor, provided by the utility model, can be used for layered water injection and clean-out service of a water injection well.