Abstract: A detachable mounting cap includes a hollow cap body and a mount hole formed inside the hollow cap body. The hollow cap body is configured to detachably connect a box body of a fiber optic distribution box, and includes a cap bottom surface configured to lie on the box body, and a front inclined cap surface inclinedly extending upward from the cap bottom surface and configured to be inclined with respect to the box body. The mount hole extends through the front inclined cap surface and the cap bottom surface, and is configured to communicate with a through hole of the box body and to detachably mount the fiber optic connector.