A protective shell includes a casing and a rotating assembly. The casing supports an electronic device. The casing includes a first portion and a second portion. The first portion includes a first joining end, and the second portion includes a second joining end. The rotating assembly includes a shaft and a hook. The shaft protrudes from the first portion adjacent to the first joining end and extends along the first joining end. The hook protrudes from the second joining end and bends toward the second portion. The second portion is rotatably connected to the first portion when the hook is hooked on the shaft. The second portion is positioned at any position relative to the first portion, and the second portion forms any desired angle with the first portion to prop up the first portion and the electronic device.