The invention discloses a commercial/civil solar jet central air conditioning system, belonging to the fields of new energy resources and energy-saving technologies. The commercial/civil solar jet central air conditioning system is composed of a solar heat collecting subsystem and a jet type refrigerating subsystem, and uses low-grade solar energy as a driving heat source, i.e. in the sunny daytime, solar heat is used mainly as the driving heat source of an air conditioning host machine; and when the sunshine is insufficient in the daytime or at night, solar energy and an auxiliary electric heater are used, or the auxiliary electric heater is directly used for providing continuous driving heat source for the air conditioning host machine. The system is suitable for a small-business or civil villa with a building area of more than 100m<2> for refrigerating in summer and heating in winter. The commercial/civil solar jet central air conditioning system has the advantages of simple structure, low cost, reliable operation, convenience in use and maintenance, positive pressure operation of the system, little power consumption, energy saving, environmental friendliness and the like, so that the application and popularization properties are greatly improved.