Combined central air conditioning unit

The invention discloses a combined central air conditioning unit, which comprises a fresh air section, an air return section, an exchange section and a refrigerator unit, wherein the refrigerator unit is communicated with the fresh air section, the fresh air section comprises a filtering section, a surface cooling section, a mixing section, a heating section, a spraying humidification section and an air supply section in sequential communication, the mixing section is communicated with the air return section, in addition, a valve assembly is arranged between the mixing section and the air return section, and the combined central air conditioning unit also comprises a collecting system, a control system and a cloud server, so that the central air conditioning unit can use a cloud server for calculation and analysis according to the climate change of the use environment, the new air return proportion can be dynamically regulated in real time, the high-precision control is realized, parameters, such as temperature and humidity, of the use environment can be regulated according to the requirements of users, the required comfort degree is achieved, and in addition, the goal of saving energy sources is realized.