The invention discloses a special all-in-one machine integrating purification, sterilization, humidification, dehumidification and constant temperature keeping for a storeroom, which is capable of realizing the functions of humidification, dehumidification, temperature regulation, sterilization and purification. The special all-in-one machine comprises a machine body, a lower water tank system, a middle dehumidification and pneumatic system, an upper humidification and sterilization system and an outdoor condenser I outside the machine body. The special all-in-one machine provided by the invention integrates the functions of humidification, dehumidification, anion air purification and sterilization, reinforces the humidification and dehumidification effects and can realize automatic detection for water leakage and water overflow failures. The brand new design guarantees a more reasonable equipment structure and the miniaturization and intelligentialization of multifunctional equipment are achieved.