A wrist strap assembly includes a flexible wrist strap and a restricting mechanism. The restricting mechanism is used to limit the bending magnitude of the flexible wrist strap, and is disposed inside and fixed to the flexible wrist strap. A wrist device is further provided, the wrist device includes the wrist strap assembly and a flexible screen. The flexible screen is provided on the flexible wrist strap, and the restricting mechanism is disposed at one side of the flexible screen.