The invention relates to a cab of a crane, specifically relates to a movable cab of a double-beam-bridge crane, and belongs to the technical field of crane equipment. The movable cab comprises a conductive frame, a towing rope device, a towing rope support, an I-beam support platform, a cab with a platform and a cab hanger, wherein a driven travelling I-beam and a drive travelling I-beam are welded at the lower end of the I-beam support platform; the top end of the cab with the platform is connected with the cab hanger; the driven travelling I-beam and the drive travelling I-beam are arranged at the upper end of the cab hanger; a driven travelling mechanism is slidably connected into the driven travelling I-beam; and a drive travelling mechanism is slidably connected into the drive travelling I-beam. The movable cab is adopted in the invention, so that personnel in the driving cab can find a better hoisting viewing angle and can see the ambient environment of the hoisted articles clearly at a glance, controllability for hoisting for heavy objects is greatly improved, and predictability for avoiding some possible safety accidents can be better improved.