The original saying is that everything recovers in spring, and women can hold up half the sky, just like women. Mainly to promote gender equality. In the old society, women's status has always been very low, so these words are used to call for women's independence and strive for their due rights.
This sentence is one of many slogans since the women's liberation movement, which is a social goal or movement to oppose discrimination against women, enable women to obtain their due social status and rights, and achieve complete equality between men and women.