Fixing device convenient for fixing ductile iron casting

The utility model discloses a fixing device convenient for fixing ductile iron castings, which relates to the technical field of ductile iron castings and comprises a working platform, and a support frame is fixedly connected to the outer side of the top of the working platform. The top supporting plate is supported through the elastic piece on the fixing plate, the hemispherical protruding block at the bottom of the top supporting plate is attached to the surface of a casting, the casting is fixed and fastened, the stability of the device for fixing the casting is improved, the position of the casting is prevented from deviating in the machining process, a rotary knob is rotated to drive a threaded transverse rod to rotate, and the machining precision is improved. According to the casting placing device, the clamping plates are made to get close to each other, the clamping plates clamp a casting, then a worker holds a grip with hands, the whole placing groove can be driven to move in a dragging mode, the wor