The utility model discloses an earphone box protective sleeve, which comprises a shell, a shell cover and a connecting piece, the shell is connected with the shell cover through the connecting piece, and the shell cover and the shell are respectively provided with an upper cavity and a lower cavity; the shell cover comprises a shell cover lower edge, the shell comprises a shell upper edge, when the shell cover covers the shell, the shell cover lower edge is attached to the shell upper edge, and the upper cavity and the lower cavity jointly form a cavity used for containing an earphone box; the earphone box protective sleeve further comprises at least two magnetic groups, each magnetic group comprises two magnetic pieces arranged on the lower edge of the shell cover and the upper edge of the shell respectively, and when the shell cover covers the shell, the two magnetic pieces in each magnetic group are magnetically connected. According to the utility model, the magnetic groups are respectively arranged at the lower edge of the shell cover and the upper edge of the shell, and when the shell and the shell cover are covered, the two magnetic pieces in each magnetic group are magnetically connected, so that the demagnetization risk is reduced, and the service life of the earphone box protective sleeve is prolonged.