A bottle cover is provided, which includes a bottom member, a sleeve, a top member, a hollow base, an elastic component, and a first sealing component. The sleeve is movably sleeved with the bottom member. The top member is disposed at the top portion of the sleeve. The hollow base is separately combined with the bottom member, and has a first hole and a second hole. The elastic component has one end sleeved with the hollow base, and the other end sleeved with the sleeve. The first sealing component includes a first buckle component detachably penetrating and buckled with the first hole, and a first cover component separately covering the second hole. A bottle to be coupled with the bottole cover is also provided.