Multifunctional fixing device and operating table

The utility model discloses a multifunctional fixing device and an operating table. The multifunctional fixing device comprises a first supporting piece, a second supporting piece, a connecting piece and an adapter. The first supporting piece and the second supporting piece are arranged at an angle, the connecting piece is connected to the first supporting piece and the second supporting piece, and the first supporting piece, the second supporting piece and the connecting piece form a containing groove used for containing the lower limbs of a patient. The adapter is installed on the side, away from the containing groove, of the first supporting piece or the side, away from the containing groove, of the connecting piece and suitable for being connected to a movable arm of the operating bed. At the moment, the movable arm can support the multifunctional fixing device and adjust the posture of the multifunctional fixing device, so that the lower limbs of the patient can be kept at preset positions for a long tim