The aim of the study was to evaluate the effects of fermented apple pomace on growth performance, nutrient digestibility, intestinal mucosal morphology and secretory immunoglobulin (SIgA) concentration of Rex rabbits. Ninety⁃six Rex rabbits at 45 days of age were randomly divided into 4 groups with 4 replicates per group and 6 rabbits (half male and half female) per replicate. Rabbits in the 4 groups were fed experimental di-ets which contained 0 (control, group CK), 9.6% (group A), 19.2% (group B) and 28.8% (group C) fer-mented apple pomace, respectively. The adaption period was 15 d, and the experiment period was 50 d. The results showed that the average daily gain of Rex rabbits in group C increased by 14.69% (P<0.05), the feed/gain decreased by 6.63% (P < 0.05) and the diarrhea rate decreased by 19.64% (P < 0.05) compared with group CK. The digestibility of dry matter, organic matter, crude protein and crude fibre in group C increased by 6.11%, 5.19%, 7.26% and 13.10% compared with group CK (P<0.05), respectively. The villus length and intestinal wall thickness of jejunum of Rex rabbits in group C increased by 59.82% and 41.83% compared with group CK (P < 0.05), respectively, and the crypt depth of duodenum decreased by 30.52% compared with group CK (P<0.05)However, different supplemental levels of fermented apple pomace had no signifi-cant effect on intestinal SIgA concentration (P>0.05)The results indicate that supplementation of fermented apple pomace at 28.8% can improve the growth performance by promoting nutrient digestibility and intestinal mucosal morphology of Rex rabbits, and can decrease the diarrhea rate, but no harmful effect on intestinal SIgA concentration.