The invention discloses a star sensor lens and a method for large temperature range accurate measurement of azimuth angles of stars by using the same. The star sensor lens comprises a lens barrel, a base, lenses, an optoelectronic image sensor, a diaphragm and a light filter which also serves as a protective window, wherein each two lenses of the four lenses form a group, the two lens groups are arranged on the two sides of the diaphragm symmetrically, object lens expansion rings are arranged at the outer sides of the two lens groups, and a spring ring for restoring and fastening is arranged between the two lens groups. Through an expansion and contraction effect of the expansion rings, the distance between the two lens groups are finely adjusted in a passive mode, so that the focus offset caused by the amount of the fine adjustment between the lenses counteracts that caused by a thermal effect of the lenses and the lens barrel. The focus star sensor lens has excellent thermal stability. According to calculation, the thermal offset delta f/f of the lens focus f is no more than 2*10<-6> within a temperature range from 20 DEG C below zero to 60 DEG C. Under a condition of a large temperature range, the accuracy of the measurement of the azimuth angles of stars of the star sensor lens reaches arc second order.