Provided are an automatic water supply nozzle for animals capable of preventing a contamination of water in a water supply container and an automatic water supply cap for animals enabling use of a variety of empty plastic bottles or glass bottles as a water supply container. The automatic water supply nozzle for animals has a nozzle cylinder equipped with an automatic water supply mechanism and a dropping cylinder equipped with at least one partition having a dropping tube, the dropping cylinder being coupled with the nozzle cylinder and the automatic water supply cap for animals having the automatic water supply nozzle for animals and an attachable/detachable cap to/from a water supply container.
