Lightweight aggregate concrete preparation system

The invention belongs to the technical field of green building materials, and particularly discloses a lightweight aggregate concrete preparation system which comprises a storage bin and a concrete mixing device. A pre-wetting device is arranged in the storage bin; the pre-wetting device comprises a driving mechanism arranged at the top of the storage bin and further comprises a circulating humidifying mechanism connected with the driving mechanism. The circulating humidifying mechanism comprises a water adding assembly and a water pumping assembly; the water adding assembly comprises water adding pipes which are uniformly distributed in the storage bin; the water adding pipes are vertically arranged, and water outlet holes are evenly distributed in the peripheral faces of the water adding pipes. The water adding pipe is connected with a water adding pump and a water outlet of the water adding pump; a water tank is connected to a water inlet of the water pump; the water pumping assembly comprises water pumpin