Background Few studies explored the effect of SES of caregivers on informal caregiving in China, especially from a female perspective. The purpose of this study was to empirically examine how the SES of female caregivers affects the amount of informal care they provide for parents in China. Methods The data used in this study was derived from the China Health and Nutrition Survey (CHNS). Informal caregivers were divided into three categories: non-caregivers (0 hrs/week), low-intensity caregivers (less than 10 hrs/week), and high-intensity caregivers (more than 10 hrs/week). Chi-square tests and one-way analysis of variance (ANOVA) were used to compare the SES of the women between non-, low-, and high-intensity caregivers. Multinomial logistic regression analysis was used to calculate relative risk ratios (RRR) for various SES variables to assess the relation of SES on the likelihood of a low- and high-intensity caregiving in the household, adjusting for age, marital status, family characteristics and wave. Results Of the 2741 respondents, high-intensity and low-intensity caregivers accounted for 16.42% and 21.38% respectively. Multinomial logistic regression results found that the likelihood of being a high-intensity caregiver vs. a non-caregivers increased as the caregiver’s education attainment increased. Urban females were 1.34 times more likely than their rural counterparts to provide low-intensity care vs. no care ( p <0.05) and were 1.34 times more likely to provide high-intensity care vs. no care ( p <0.05). Employed females were 1.27 times more likely than those non-employed to provide low-intensity care vs. no care ( p <0.05). Conclusions Differences in SES were found between high-intensity caregivers and low-intensity caregivers. Women with higher SES (higher education attainment, higher incomes, and urban Hukou ) were more likely to provide high-intensity informal care, and women who were employed and with urban Hukou were more likely to provide low-intensity care.