The present invention provides an external remote blood supply device for plastic free flaps, comprising a venipuncture needle, a first conduit, a precision peristaltic pump, a second conduit, a flap venous anastomosis needle, an arterial puncture needle, a third conduit, a third conduit Through head, fourth catheter, precision syringe pump, replaceable filter cartridge structure, flap arterial anastomosis needle, heating box, circulating copper tube, disassembly and assembly tube, constant temperature water tank, water pump, disassembly and assembly fixed belt structure, auxiliary traction storage plate structure , the auxiliary support plate frame structure, the fifth conduit and the sixth conduit, and the venipuncture needle is inserted into the upper end of the first conduit. The beneficial effects of the present invention are: through the arrangement of the replaceable filter cartridge structure, when the plug-in plate frame is pulled or pushed, different filter screens can be corresponding to the communication pipes, and then during use, they can be replaced accordingly. The filter screen is used, and the blockage of the single filter screen is avoided, which affects the use.