Connecting device and surgical system

The embodiment of the invention provides a connecting device and a system. The device is a device for fixedly connecting a trolley and a surgical bed. The connecting device is characterized by comprising a first cross bar, a second cross bar and an adsorption unit, wherein slidable clamps are arranged on the first cross bar and can slide on the first cross bar so as to change clamping positions of the clamps on the surgical bed; the second cross bar and the first cross bar are arranged in the same horizontal plane; one end of the second cross bar is connected with the first cross bar according to a mode that a preset included angle is formed between the second cross bar and the first cross bar; the adsorption unit is connected to the other end of the second cross bar by a horizontal hinge mode and is adsorbed on the trolley; the mounting height of the trolley is adjusted by changing a longitudinal adsorption position of the adsorption unit on the trolley; a placement included angle between the trolley and the surgical bed is adjusted by rotating the adsorption unit leftwards and rightwards.