A time-sharing dehumidification method for a multi-split system, characterized in that the time-sharing dehumidification method comprises: a control cycle of a time-sharing dehumidification process, comprising controlling at least one dehumidification indoor unit of a plurality of dehumidification indoor units that have not operate in a dehumidification mode in the time-sharing dehumidification process to operate in the dehumidification mode; and setting an operation mode of each remaining dehumidification indoor unit to be a temporary non-dehumidification mode, a total volume of evaporator(s) of the at least one dehumidification indoor unit being not greater than a total volume of condenser(s) of at least one current heating indoor unit, wherein the time-sharing dehumidification process refers to a process in which the plurality of dehumidification indoor units each operate in the dehumidification mode once, the time-sharing dehumidification process includes at least two control cycles, the control cycle is any one of the at least two control cycles, and the time-sharing dehumidification process includes sequentially performing the at least two control cycles until each dehumidification indoor unit in the plurality of dehumidification indoor units operates in the dehumidification mode once; wherein in the time-sharing dehumidification process, the at least one dehumidification indoor units are controlled to operate in the dehumidification mode at different periods; the dehumidification indoor unit is an indoor unit that operates in the dehumidification mode; the temporary non-dehumidification mode is a mode in which the dehumidification indoor unit does not perform the dehumidification in the control cycle; a volume of the evaporator of the at least one dehumidification indoor unit is a volume of an evaporator of the at least one dehumidification indoor unit used for containing a refrigerant; the total volume of the evaporator(s) of the at least one dehumidification indoor unit is a sum of volume(s) of evaporator(s) of each of the at least one dehumidification indoor unit in the multi-split system used for containing the refrigerant; a volume of a condenser of the at least one current heating indoor unit is a volume of a condenser of the at least one current heating indoor unit used for containing the refrigerant; the total volume of the condenser(s) of the at least one current heating indoor unit is a sum of volume(s) of condenser(s) of each of the at least one current heating indoor unit in the multi-split system used for containing the refrigerant. a control cycle of a time-sharing dehumidification process, comprising controlling at least one dehumidification indoor unit of a plurality of dehumidification indoor units that have not operate in a dehumidification mode in the time-sharing dehumidification process to operate in the dehumidification mode; and setting an operation mode of each remaining dehumidification indoor unit to be a temporary non-dehumidification mode, a total volume of evaporator(s) of the at least one dehumidification indoor unit being not greater than a total volume of condenser(s) of at least one current heating indoor unit, wherein the time-sharing dehumidification process refers to a process in which the plurality of dehumidification indoor units each operate in the dehumidification mode once, the time-sharing dehumidification process includes at least two control cycles, the control cycle is any one of the at least two control cycles, and the time-sharing dehumidification process includes sequentially performing the at least two control cycles until each dehumidification indoor unit in the plurality of dehumidification indoor units operates in the dehumidification mode once; wherein in the time-sharing dehumidification process, the at least one dehumidification indoor units are controlled to operate in the dehumidification mode at different periods; the dehumidification indoor unit is an indoor unit that operates in the dehumidification mode; the temporary non-dehumidification mode is a mode in which the dehumidification indoor unit does not perform the dehumidification in the control cycle; a volume of the evaporator of the at least one dehumidification indoor unit is a volume of an evaporator of the at least one dehumidification indoor unit used for containing a refrigerant; the total volume of the evaporator(s) of the at least one dehumidification indoor unit is a sum of volume(s) of evaporator(s) of each of the at least one dehumidification indoor unit in the multi-split system used for containing the refrigerant; a volume of a condenser of the at least one current heating indoor unit is a volume of a condenser of the at least one current heating indoor unit used for containing the refrigerant; the total volume of the condenser(s) of the at least one current heating indoor unit is a sum of volume(s) of condenser(s) of each of the at least one current heating indoor unit in the multi-split system used for containing the refrigerant.