Multi-split air-conditioning system

The invention belongs to the technical field of multi-split air-conditioning, and aims to the solve the problem that when indoor units of an existing multi-split air-conditioning system execute a refrigeration mode, a heating mode and heating standby, a refrigerant generates noise in flowing through an electronic expansion valve. The invention provides a multi-split air-conditioning system. The multi-split air-conditioning system comprises an outdoor unit and a plurality of indoor units; each indoor unit comprises a liquid containing component, a heat exchange component, an electronic expansion valve and a plurality of indoor coils; each indoor coil is connected with one of the corresponding liquid containing component and the corresponding heat exchange component through a first connecting pipe; the outdoor unit is connected with the other of the liquid containing components and the heat exchange components through second connecting pipes; two ends of the electronic expansion valves are separately connected