Lost foam casting equipment based on closed negative pressure pouring system

The invention provides lost foam casting equipment based on a closed negative pressure pouring system, which comprises a material storage box, a casting system and a casting system, and the fixed plate is fixedly mounted at the top of the storage box and located on the outer side of the open end of the storage box. When the device is used, ceramsite in the storage box can be conveyed into the feeding pipe through the feeding mechanism, the mode that a worker manually fills a casting box with ceramsite is replaced, and labor is saved; after the foamed plastic mold is coated and compacted, the casting box moves upwards to be attached to the plugging cover, the air exhaust piece is controlled to enable negative pressure to be formed in the negative pressure box, molten metal is injected into the casting box through the liquid injection pipe to make contact with the foamed plastic mold, the foamed plastic mold is gasified to generate waste gas, and the waste gas enters the negative pressure box through the air ou