The objective of this work is to evaluate the fertilization and embryotoxic effects of aqueous extract of Cnestis ferruginea in rats. First, 3 batches of rats (control, treated AECF50 and AECF100) were mated with untreated males. Then, 3 batches of male rats (control, treated AECF50 and AECF100) were mated with untreated females. Finally, two groups of rats, I (males) and II (females) were subdivided into three batches each (control, treated AECF50 and AECF100) and were mated according to the dose. The results showed 100% gestation in the treated females, but an increase in the post-implantation abortion rate with the AECF100. Regarding the test of treated males, the pregnancy, copulation and fertility rates were 75%, 83.33% and 100% for controls, AECF50 and AECF100, respectively. Pre-and post-implantation abortion rates decreased with both doses. The test of treated males mated with the treated females showed a pregnancy rate, a copulation index, and a 100% fertility index compared to controls (83.33%). For the uterine, fetal and placental weights, the extract induced a significant increase in the treated females. Histological studies of the ovary showed a significant increase in the diameter of the corpus luteum (35.14%) and the diameter of the uterine glands by 16.05% (AECF50) and 18.39% (AECF100). In conclusion, Cnestis ferruginea improves fertility in males and females. But, these positive effects can be hindered by high doses.