NOVELTY - Preparation of titanium dioxide nanotube loaded palladium nano catalyst comprises utilizing two-electrode electrochemical electrolytic cell system as working electrode and auxiliary electrode as titanium sheet, reacting palladium nanoparticle chemical deposition solution comprising solution A and solution B, reacting in titanium dioxide nanotube array electrode and solution A; and using tri-electrode electrochemical electrolytic cell system, adding electrochemical solution in electrolytic tank, washing with deionized water and drying.    USE - Method of preparation of titanium dioxide nanotube loaded palladium nano catalyst used for preparing fuel battery, and used in organic synthesis.    DETAILED DESCRIPTION - Preparation of titanium dioxide nanotube loaded palladium nano catalyst comprises utilizing two-electrode electrochemical electrolytic cell system as working electrode and auxiliary electrode as titanium sheet, injecting fluorinated ethylene glycol electrolyte to ammonia, controlling anode oxidation potential of 30-90 V, for 5-2 hours, taking out sample after anode oxidation, washing after drying, annealing to obtain titanium dioxide nanotube array, grinding and polishing; ultrasonic cleaning, adding 1-10% perchloric acid and 90-99% electrolytic cell in acetic acid solution, controlling anode oxidation potential of 40-60 V, and disposing for 5-20 seconds to obtain titanium dioxide nanotube array electrode; reacting palladium nanoparticle chemical deposition solution comprising solution A and solution B, reacting in titanium dioxide nanotube array electrode and solution A, deionized water, solution B and deionized water, immersing for 5-15 seconds, repeating for 5-30 times, to obtain titanium dioxide nanotube load palladium nano particle, and preparing electrochemical processing solution; and using tri-electrode electrochemical electrolytic cell system, adding electrochemical solution in electrolytic tank, using electrode as working electrode, auxiliary electrode and reference electrode, with working electrode comprising titanium dioxide nanotube array load palladium electrode, auxiliary electrode comprising palladium, using electrochemical procedure potential step processing method with upper limit potential of 5-5.5 V for 10-300 seconds, lower limit potential of -4.5 to 0.5 V for 10-300 seconds, processing for 0.1-6 hours, taking out working electrode, washing with deionized water and drying to obtain titanium dioxide nanotube load palladium nano catalyst.