The invention discloses a fire prevention system for high-rise storage buildings. The fire prevention system for the high-rise storage buildings comprises a fixed cylinder; a direct flow pipe is arranged in the fixed cylinder; two arc-shaped lateral flow channels are formed between the inner wall of the direct flow pipe and the inner wall of the fixed cylinder; a direct flow water channel is formed in the direct flow pipe; a movable groove is formed in the middle part of the direct flow water channel; two flow limiting plates which are distributed at up-and-down intervals are arranged in the movable groove in a sliding way; the upper part and the lower part of the direct flow water channel are communicated with each other through hoses with the end parts running through the two flow limiting plates correspondingly; a water spattering disk is rotatably arranged on the outer wall of the extending end of the direct flow pipe; and the circumferential outer edge of the upper surface of the water spattering disk is inclined downwards along the axis. Through cooperative use of a plurality of fire prevention systems, namely the fire prevention systems are arranged on the side wall of a storage rack and at the bottom of a cross beam and perform omni-directional coverage on more or single oil barrel; once fire appears on the storage rack, fire-fighting water sprays the oil barrels at the first time through the direct flow water channel and the lateral flow channel, no spraying blind point of the oil barrel is guaranteed, and safe storage of the oil barrel is guaranteed.