The invention discloses a quadripod mechanism convenient to open and close, a multipurpose clamping device and an integrated selfie stick, and belongs to the technical field of photography and video recording equipment. The quadripod mechanism comprises a quadripod body, a connecting body, a rod body and a key device. An telescopic rod can be directly pulled out by pressing a button or pressing akey, and the quadripod body which is synchronously opened outwards or synchronously folded inwards can be quickly realized and can be automatically positioned. In addition, the multipurpose clamping device further comprises a main connector device, a J-shaped connecting base, a connecting block, a J-shaped clamping base and a telescopic clamp. A connecting device further comprises a connecting sleeve, a sleeve base and a Bluetooth remote controller. In addition, a traditional tripod is replaced by the quadripod in a matched mode, and the problems that when the tripod is opened, the plane stability is not enough, and the tripod is prone to toppling in a certain direction during operation are solved. The quadripod mechanism convenient to open and close, the multipurpose clamping device and the integrated selfie stick are simpler in structure, selectable in function, lower in cost, easier to assemble, more convenient to operate, more attractive in appearance and capable of better meetingmarket requirements due to the fact that injection mold stripping is adopted.