Protective leather case and positioning device

A positioning device used in conjunction with the-a protective leather case comprising:

• a leather layer:
• an adhesive layer;
• and
• a positioning release film,
• wherein the leather layer, the adhesive layer and the positioning release film are laminated sequentially, the positioning release film comprises a first release film and at least two second release films, the first release film is provided in a first direction, and the at least two second release films are arranged on opposing sides of the first release film in a second direction perpendicular to the first direction,
• the positioning device comprising a positioning piece provided with a positioning boss that matches a charging interface of a smart terminal, the leather layer is provided with a first charging interface opening that matches the charging interface of the smart terminal, the positioning release film is provided with a second charging interface opening that matches the charging interface of the smart terminal, the positioning boss is configured to extend through the first charging interface opening and the second charging interface opening, so as to position the leather layer, the positioning release film, and the smart terminal.