Disclosed are a multi-guidewire balloon dilatation catheter structure, a dilatation catheter mechanism and a medical device. The multi-guidewire balloon dilatation catheter comprises a balloon, a first guidewire channel, a second guidewire channel and a third guidewire channel. The first guidewire channel is at least partially passed through the balloon. The second guidewire channel is at least partially located at the distal end of the balloon. The third guidewire channel is at least partially located at the proximal end of the balloon. In the multi-guidewire balloon dilatation catheter structure of this embodiment, each guidewire channel can be used for accommodating the guidewire by providing the first guidewire channel and the second/third guidewire channel to assemble various devices on the single catheter of the present invention, thereby realizing simultaneous execution of device guidance, plaque cutting, guidewire anchoring, etc. The structure is simple and good in use effect.