The invention relates to a preparing device of a high-effective continuous-type electro-spin nanometer fiber felt, the invention comprises a fluid supply system, a metal roller, a receiving device and a spinning fluid recycling groove. The process for preparing comprises firstly, preparing polymer spinning fluid with correct concentration in a dissolution kettle, temporarily storing in a liquid storage tank after passing through a filter, secondly, connecting the metal roller and the positive electrode of a high-pressure electrostatic generator, applying correct electrostatic pressure, leading an aluminium screen cloth to connect ground, thirdly, leading the metal roller to rotate in correct rotary speed, fourth, starting a measuring pump, feeding spinning liquid from the liquid storage tank to an even allotter, leading the spinning liquid to be evenly allocated to a spraying hole on the front end of the even allotter, sputtering from the spraying hole to the surface of a rotating metal roller to form Taylor awl, fifthly, leading a coiling drum to rotate to drive a fiber receiving net to move, and continuously receiving nanometer fiber felt. The process for preparation of the nanometer fiber felt of the invention has high production efficiency, which is suitable for scale production of electro-spinning.