A method and equipment for improving quality of vegetable oil through continuous crystallization, crystal growing, and dewaxing refining are disclosed. Oil and grease dewaxing is performed through eight-stage staged cooling crystallization, six-stage constant-temperature crystal growing, and two-stage low-temperature filtration. Special crystallization and crystal growing devices are adopted, interferences of transmission on crystallization and crystal growing processes are effectively solved as a whole, the heat conduction efficiency is higher, crystal damage caused by a transmission device and relative movement in an oil and grease system is less, energy consumption is lower, crystal dispersibility is significantly improved, and aggregation effects of wax, esters and high-melting-point fat are better. The method and the equipment can further improve dewaxing, winterization and dewaxing effects in crystallization and crystal growing processes of wax-containing vegetable oil, prolong oil product refrigeration time to 60 h or above, improve flavor and quality of oil and make oil palatability good. The method and the equipment are suitable for corn oil, sunflower seed oil, soybean oil, rice bran oil, and the like, and are particularly suitable for corn oil, sunflower seed oil, and the like.