Cab of engineering machine

The invention relates to a cab of an engineering machine, which is provided with an ROPS (roll-over protection system) and aims to overcome the shortcoming that a thick and heavy steel plate is welded at the bottom an existing cab to be used as a mounting support so that steel consumption is high. The cab comprises a framework, the framework consists of upright columns and transverse framework components, the upright columns are vertically arranged, the transverse framework components are positioned below the middles of the upright columns, vertical through holes are disposed on the transverses framework components and are adjacent to the upright columns, and threaded connecting components which are used for being connected with mounting bots of the cab in a threaded manner are arranged at the upper ends of the through holes or disposed in the through holes. During installation, the threaded connecting components are connected with the mounting bolts of the cab so that the cab is mounted without welding the t