The invention discloses a combined operating machine for cotton stalk pulling-up, smashing and returning and surface-layer residual film recovery. The combined operating machine comprises a three-point suspension device, a cotton stalk shifting device, a cotton stalk pulling device, a cotton stalk smashing device, a smashed cotton stalk conveying device, a film taking device, a residual film conveying device, a transmission, a film collecting box, walking wheels and a walking wheel control oil cylinder which are sequentially installed on a machine frame from front to back. A tractor and the combined operating machine for cotton stalk pulling-up, smashing and returning and surface-layer residual film recovery form a combined operating unit, and the tractor drives the cotton stalk shifting device, the cotton stalk pulling device, the cotton stalk smashing device, the smashed cotton stalk conveying device, the film taking device and the residual film conveying device to work. In the working process, the combined operating unit forwards advances at constant speed along cotton seedling lines under the traction of the tractor, power output by the tractor is transferred to the working parts under the driving effect of the transmission. The combined operating machine is good in residual film recovery effect and high in reliability and operating efficiency and saves time and labor in use.