Steel component locking and fixing structure

The invention provides a steel component locking and fixing structure. The steel component locking and fixing structure comprises a cross beam and longitudinal beams made of box iron. Openings are formed in the side walls of the upper ends and the lower ends of the longitudinal beams in a cut manner. The openings of the two adjacent longitudinal beams are opposite. The cross beam is located on theopenings of the longitudinal beams. Locking grooves are formed in the end walls of the two ends of the cross beam and the longitudinal beams, one end of each locking groove is a locking end, and theother end of each locking groove is an unlocking end. The widths from the locking ends to the unlocking ends are gradually increased. A rotary shaft is arranged on one side of each locking groove of each longitudinal beam. A locking arm is in shaft connection to each rotary shaft. A locking device is arranged at the end of each locking arm and comprises a bolt, a nut, a fastening disc and a handle. Each bolt is in a T shap