Sand core mold structure

The utility model discloses a sand core mold structure and relates to the technical field of sand core mold equipment. Comprising a lower die, an upper die, a top plate, a first runner, a first die cavity, a second runner, a second die cavity, a fixing rod, a through groove, a lead screw, a rotating disc, a mounting block, an extension spring, a sliding block, a limiting groove, a first bolt hole, a second bolt hole, a first cavity, a compression spring, a second cavity, a telescopic rod and a movable block. According to the utility model, the mounting block is pulled to approach the sliding block through the elastic force of the extension spring, so that the top plate is pulled to approach the lower die, the bottom of the top plate is tightly attached to the top of the upper die, and the bottom of the upper die is tightly attached to the top of the lower die, so that the lower die, the upper die and the top plate are ensured to be tightly contacted and prevented from loosening; the working effect of the devi