The invention relates to a wind pressure type three-cabin wind separator composed of two separating cabins and one blanking cabin serially connected and provided with integrated dynamic wind pressure, is especially applicable to wind separation for easily broken materials, and belongs to wind separation equipment. The upper side wall of the first separating cabin is communicated with the upper side wall of the second separating cabin, and the upper side wall of the second separating cabin is communicated with the upper side wall of the blanking cabin to form a structure with the three cabins serially communicated, and a transferring mesh belt is arranged on a channel port of the inside walls, where the three cabins are serially communicated, of the two separating cabins and the one blanking cabin. The transferring mesh belt is horizontally arranged, a wind curtain for isolating the two cabins is arranged on a channel port where the first and second separating cabins are communicated, and another wind curtain for isolating the two cabins is further arranged on a channel port where the second separating cabin and the blanking cabin are communicated.