The invention discloses an optical level quartz crystal temperature-changing temperature differential method growth technology, comprising the following steps that: firstly, raw materials of seed crystal and quartzite are washed, deionized water and a growth-promoting media are prepared, and a high-pressure autoclave is washed by ionized water and is drained off by a membrane pump; secondly, a raw material basket holding the quartzite is put in the washed autoclave, the prepared grow-promoting media and a seed crystal bracket hung with the seed crystal are poured into the autoclave, the liquid level is measured, and the autoclave opening is sealed; thirdly, a temperature control system is started, the high-pressure autoclave is heated, the parameters of temperature, pressure and time of the sealed high-pressure autoclave are adjusted so that the quartz crystal is grown and formed. The optical level quartz crystal temperature-changing temperature differential method growth technology is characterized by determining the lineage grade of the seed crystal, the a equivalent concentration of the grow-promoting media, the parameter of a filling degree of the autoclave, the temperature changing and differential parameter and the pressure parameter of the heated high-pressure autoclave. According to the quartz crystal produced by the technology, the lineage index is more than the grade A, the etch channel density is less than 10 strips per centimeter<2>, the value of Q is more than or equal to 3.0x10<6>, an inclusion is higher than the Ia type, the optical uniformity delta n is less than or equal to 5x10<-6>, and the spectrum transmission ratio is more than 95 percent when the wavelength is between 800 and 2, 500 nanometers.