The invention belongs to the field of household appliances and particularly relates to a door opening motor 
assembly, an automatic door opening 
system, a work method and a refrigerator. The door opening motor 
assembly comprises a door opening motor, a front stage gear set, an output shaft, a rear stage gear set and an 
electromagnetic clutch, wherein the front stage gear set is located at the door opening motor end; the output shaft is used for controlling a door to rotate; and the rear stage gear set is located at the output shaft end. The 
electromagnetic clutch is used for enabling the front stage gear set to be in transmission fit with the rear stage gear set after being electrified, i.e., after the 
electromagnetic clutch is electrified, the front stage gear set and the rear stage gear set are engaged with a 
clutch gear in the electromagnetic 
clutch, so that the torque of the door opening motor is transmitted to the output shaft. The door opening motor 
assembly pushes the 
clutch gear to the transmission position of the front stage gear set and the rear stage gear set after being electrified through the electromagnetic clutch, and the door opening motor transmits power to the output shaft so as to achieve the purpose of automatic door opening and closing; if the power is 
cut off, the electromagnetic clutch enables the clutch gear to be disconnected from the transmission position; and therefore, the purpose of manual door opening and closing is achieved.