Nodular cast iron well lid and preparation method thereof

The invention relates to the technical field of well lids, in particular to a nodular cast iron well lid and a preparation method thereof. Comprising a fixing assembly, a die-casting assembly, a clamping assembly and a cooling assembly, the die-casting assembly comprises a containing disc, a die bottom plate, a die cover plate, a hydraulic mechanism and an operation table, when the nodular cast iron well lid needs to be produced, firstly, raw materials are placed on the die bottom plate on the containing disc, the die bottom plate is filled with the raw materials through a worker, and the hydraulic mechanism is started through the operation table; the hydraulic mechanism pushes the die cover plate to start to move, pressure casting is conducted on raw materials on the die bottom plate, after forming is completed, the clamping assembly can be started, the formed nodular cast iron well lid is grabbed and moved to the position of the cooling assembly, the nodular cast iron well lid is rapidly cooled through the