The invention discloses an agricultural-machine engine electromagnetic clutch. The agricultural-machine engine electromagnetic clutch comprises a clutch shell. A coil installing sleeve is fixed in the clutch shell, a coil is packaged into an annular groove in the coil installing sleeve, a main shaft is installed in the clutch shell, an outer gear sleeve is connected on the main shaft, and the inner end of the outer gear sleeve is sleeved with an inner armature; an inner gear ring is arranged in the clutch shell and used for being connected with an engine flywheel; a plurality of outer-gear friction plates and a plurality of inner-gear friction plates are arranged between the inner gear ring and the outer gear sleeve, are sequentially arranged at intervals and are engaged with teeth of the inner gear ring and teeth of the outer gear sleeve respectively, the outer end of the teeth of the outer gear sleeve is sleeved with an outer armature, and the outer armature is engaged with the outer gear sleeve through a plurality of teeth and can axially slide along the outer gear sleeve; an output belt wheel is connected to the other end of the main shaft. The agricultural-machine engine electromagnetic clutch has the advantages that operation is easy, remote control of the clutch can be achieved through an electric switch, a gap does not need to be adjusted, the fault rate is low, the service life is long, the structure size is small, and whole machine design is convenient.