A method for efficiently removing nitrate from underground water through a Ti-graphene electrode includes the following steps of adding crystalline graphite powder into a beaker, adding NaNO3, H2SO4, KMnO4, deionized water and H2O2 at the temperature of 60 DEG C into the beaker in sequence, going through the low-temperature stage, the intermediate-temperature stage and the high-temperature stage, conducting centrifuging, cooling and drying to obtain graphene oxide powder, preparing a graphene oxide solution, adding sodium dodecyl benzene sulfonate, soaking a preprocessed Ti electrode plate in the solution and then pulling the preprocessed Ti electrode plate out of the electrode plate, naturally drying the electrode plate to obtain the finished product Ti-graphene electrode, adding sodium sulfate to nitrate polluted water, setting current electrolysis with the Ti-graphene electrode as the cathode and a Ti / Pt electrode as the anode, conducting reduction to remove nitrate, and reducing nitrate to generate nitrogen, nitrite or ammonia after nitrate obtains electrons on the cathode so that the nitrate removing aim can be achieved. By means of the Ti-graphene electrode prepared with the aid of graphene oxide, nitrate is effectively removed in an electrochemical reaction tank without other auxiliary processing devices.