The invention discloses a self-fitting digital temperature compensation crystal oscillistor and a system and a realization method thereof, which uses resources thereof, finishes the temperature compensation fitting process in an autonomous manner, thus ensuring the consistency of the product inner environment and production environment, improving the accuracy of the temperature compensation data and ensuring the frequency temperature stability precision. The fitting test process has the advantages of avoiding the whole-process control from computers, improving the production efficiency in each unit time and preventing the risks caused by abnormal peripheral or manual misoperation. In the invention, the temperature property index of the pilot production product is -40 DEG C to +85 DEG C, has better property with all being less than plus or minus 0.05ppm, exceeds 10-20 times than the like products, is higher than the frequency temperature stability index of three-level clock constant-temperature crystal oscillistor, and ensures the frequency temperature stability precision to get the optimal effect.