The invention discloses high-strength nickel-based brazing filler metal containing boron alkene. The high-strength nickel-based brazing filler metal containing the boron alkene is prepared from 60-160 parts of nickel, 16-29 parts of palladium, 6-15 parts of metalized boron alkene, 2.5-9.0 parts of rubidium, 2-16 parts of copper, 1-3.5 parts of carbon, 1.2-4.5 parts of chromium and 0.1-0.3 part of microelements in s smelting mode. A smelting method comprises the steps that the metalized boron alkene and 50-65% of nickel are smelted to prepare a nickel/boron alkene alloy material Al through a vacuum smelting furnace; then the chromium, palladium, copper and 25-30% of nickel are smelted in the vacuum smelting furnace to obtain an alloy A2; and the rubidium, microelements, carbon and the rest of nickel are smelted in the vacuum smelting furnace to obtain an alloy A3; and the alloy A2 and the alloy A3 are added in sequence after the alloy material A1 is smelted, a molten nickel-based alloy is obtained, and the silk-shaped or strip-shaped nickel-based brazing filler metal is obtained after the molten silver-based alloy is machined through a conventional method. The researched and developed nickel-based brazing filler metal containing boron alkene does not contain poisonous or harmful elements, and is environmentally friendly, moderate in smelting temperature, good in wettability and high in strength.