The invention discloses an efficient bar cutting structure. The efficient bar cutting structure comprises a cross beam, a first support, a second support, four guide wheels, a band saw blade, a cutting motor and an adjusting mechanism. The first support and the second support are transversely arranged below the cross beam and are equal in length. The four guide wheels are arranged at the two ends of the first support and the two ends of the second support correspondingly. The band saw blade is arranged on the outer sides of the four guide wheels in a sleeving manner. The cutting motor drives any guide wheel to rotate. The middle of the first support is hinged to that of the second support. The adjusting mechanism is used for adjusting the included angle between the first support and the second support, and therefore the band saw blade is tensioned into rectangles of different widths, and bars of different lengths can be cut out. According to the bar cutting structure, two bar joints can be cut out from a single bar every time cutting motion is completed once, and compared with a traditional cutting structure, cutting efficiency is greatly improved.