The utility model discloses a cooling device of a plastic granulator. The cooling device comprises a cooling box, the hot water tank is located on one inner side of the cooling box, a first partition plate is arranged between the
warm water tank and the hot water tank, and a first heating rod is arranged in the hot water tank; the
warm water tank is located in the middle of the cooling box, and a second heating rod is arranged in the
warm water tank; the cold water tank is positioned on the other inner side of the cooling box; the air-
drying cooling mechanism comprises a support, a fan, a ventilation
pipe, a ventilation cavity and an air outlet hole, the support is in an opening shape, the support is fixed to one outer side of the cooling box and is close to the cold water tank, the fan is installed at the top of the support, and the fan is communicated with the ventilation cavity through the ventilation
pipe. According to the utility model, the product quality is improved, the
cooling efficiency and effect are improved, and meanwhile, water on the strip material belt can be blow-dried, so that subsequent
pelletizing is facilitated. A first spacing plate is arranged between the warm water tank and the hot water tank, and a second spacing plate is arranged between the cold water tank and the warm water tank, so that cooling water at different temperatures can be stored, and the cooling quality is ensured.