Ultraviolet (UV) rays have long term negative effects that can arise such as sunburn, aging, dark spots and skin cancer. Sunscreen can protect skin from ultraviolet light, the strenght of sunscreen is shown through the magnitude of the SPF value. This study aims to determinate the potensial SPF value and total flavonoid content of ethanol extract, n-hexane and ethyl acetate fraction of jamblang old leaves (Syzygium cumini L.) and to find out correlation between total flavonoid and SPF value of jamblang leaves. The total content of total flavonoid was determined using the AlCl3 colorimetric method. The analysis was carried using by UV-Vis spectrophotometry. The total flavonoid content results showed that the n-hexane fraction had a high total flavonoid content of 1,902% then ethyl acetate fraction was 0,951% and ethanol extract was 0,453%. Determination of the SPF value was carried out using a spectrophotometry at a wavelength 290-320 nm. Determination of the SPF value is based on the Mansur equetion. The ethyl acetate fraction had a highest sunscreen activity between n-hexane fraction and ethanol extract. The SPF value in sequence is 5,977 (100 ppm); 12,555 (200 ppm); 20,459 (300 ppm); 4,029 (100 ppm); 6,749 (200 ppm); 9,834 (300 ppm); 3,213 (100 ppm); 7,497 (200 ppm); 11,268 (300 ppm).