The invention discloses a harvester electromagnetic clutch gearbox which structurally comprises a box body, a clutch cover and an input belt wheel. A first shaft assembly, a middle shaft assembly, a left half shaft assembly and a right half shaft assembly are installed in the box body. The clutch cover is installed on the side face of the box body through hexagon socket head cap screws. The first shaft assembly is installed in the box body and the clutch cover. The input belt wheel is connected with a flange through bolts. The part, located in the clutch cover, of the first shaft assembly is provided with a spline sleeve. A middle gear is installed on the spline sleeve through a second deep groove ball bearing. The middle gear is connected with an electromagnetic clutch installed on the first shaft assembly. The electromagnetic clutch is connected with the spline sleeve through hexagon socket head cap screws and meanwhile fixed to the clutch cover through screws. The harvester electromagnetic clutch gearbox has the advantages of being reasonable in design, convenient to operate and the like; the failure that an existing diaphragm spring clutch is burnt down is effectively eliminated, higher reliability is achieved, the work intensity of a machinist is reduced, and the driving comfort of the whole machine is improved.