The invention discloses a method for preparing active carbon for super capacitor utilizing a polyvinyl chloride waste material. The method comprise steps of: crushing the polyvinyl chloride waste material and screening to obtain pellets with a particle size no more than 5 mm; mixing the obtained pellets, CaO powder and water, stirring well, drying at 60-100 DEG C for 4-6 h and placing in a tubular furnace; carbonizing and activating in a nitrogen or argon atmosphere for 1-4 h; cooling to a room temperature, carrying out an ultrasonic cleaning on an obtained sample with dilute hydrochloric acid or dilute nitric acid for 3-5min and stirring for a 6-7 h reaction; filtering and washing to neutral; and drying to obtain a finished product. The invention has low production costs and simple preparation technology, and is green and environment-friendly; the prepared active carbon has high specific surface area and reasonably distributed aperture. A super capacitor using the active carbon as anelectrode material provided by the invention has characteristics of high energy density and good product performances, etc.