The utility model discloses an antifog heat preservation device of centre gripping formula peritoneoscope camera lens, the device is including clamping device, heating system, shell and inner wall packing ring. The utility model discloses a design of centre gripping formula directly will through clamping device before the operation when using the device centre gripping is opened switch heat preservation system and can be worked on the pole of peritoneoscope, the simple installation, and the operation is carried out the in -process and need not to dismantle, can improve operation efficiency effectively, the utility model discloses a heating system is high -efficient stable, has the good nice and warm heat preservation effect that adds to the peritoneoscope camera lens, can effectively reduce the knot fog phenomenon of camera lens among the laparoscopic surgery, the utility model discloses the security of operation is guaranteed for disposable device to the device.