The invention relates to a cab. The cab comprises two door upright columns, two longitudinal beams, a main cross beam, two main upright columns and an upper cross beam, wherein the two door upright columns are arranged on the side walls on the two sides of the cab respectively; one end of each longitudinal beam is arranged on a top cover of the cab, while the other end is arranged on the main cross beam; the main cross beam is positioned below a front wind of the cab; the two ends of the main cross beam are connected with the two door upright columns respectively; the main upright columns arearranged between the main cross beam and the floor of the cab; the upper cross beam is positioned between the two longitudinal beams; the two ends of the upper cross beam are connected with the two longitudinal beams; and the door upright columns, the longitudinal beams, the main cross beam, the main upright columns and the upper cross beam are formed by performing cold bending on hollow aluminumprofiles. When 300 KN of longitudinal pressure is applied to the main cross beam under the front window of the cab, the force is delivered to the vehicle body through the longitudinal beams, the doorupright columns and the main upright columns, so that the cab has no obvious deformation and the safety of a driver is ensured to a great extent.