The invention discloses a connection rod structure-based cascade wind tunnel rotation window support mechanism. The connection rod structure-based cascade wind tunnel rotation window support mechanismcomprises rotation windows, a substrate, support beams, a shaft and lining pads, wherein the support beams are in linkage with the rotation windows, the shaft penetrates through a circle center holeof a left rotation window and a right rotation window, two pairs of support beams are arranged at two sides of the rotation windows, one of the two pairs of support beams is in a horizontal direction,the other pair of support beams is in a vertical direction, one end of each support beam is fixedly arranged on the base by a bolt, and a round ring is arranged at the other end of each support beam.Gravity of the rotation windows are borne by the support beams, the strength, the rigidity and the rotation accuracy of the rotation window support mechanism can be improved, and the friction force between the rotation windows and the base is reduced on the premise that the manufacturing cost is not increased; a stable triangular support structure is formed between the support beams at the two sides and the base, all freedom degrees of the rotation windows rotating a part except an axis are eliminated, so that the mechanism is suitable for a horizontal type experiment table and is also suitable for a vertical type experiment table; and the support mechanism is low in production cost and simple in manufacturing cost and is particularly suitable for a planar cascade wind tunnel experiment table for teaching.