A sliding shell comprises a first shell body with a first surface, a first interface layer formed by coating a smooth material on the first surface, a first sliding assembly formed on the first surface of the first shell body, a second shell body with a second surface, and a second sliding assembly formed on the second surface of the second shell body. The second sliding. assembly is correspondingly connected to the first sliding assembly to allow the first shell body sliding between the first position and the second position on the second shell body. In addition, the first interface layer overlaps the second surface, and thus the first interface layer can make the sliding between two shell bodies with benefits of smooth sliding and abrasion prevention.