Bioremediation agent for oil-contaminated saline-alkali soil and application of bioremediation agent

The invention relates to the technical field of soil remediation, in particular to a bioremediation agent for oil-contaminated saline-alkali soil and application of the bioremediation agent. The bioremediation agent is prepared from the following components in parts by mass: 22 to 45 parts of biomass filler; 42 to 78 parts of immobilized microspheres; 3-10 parts of a nutrition activator; wherein the biomass filler is prepared from wood chips, rice chaff, straws, cow dung, wheat bran and walnut shells; the immobilized microspheres are composed of saline-alkaline tolerant hydrocarbon-philic bacteria, biological enzyme, nano urea peroxide particles, sodium alginate and activated carbon. The nutrition activating agent is prepared from yeast powder, NH4Cl, urea and K2HPO4. All the components are low in price and easy to obtain, the processing and using method is simple, and the cost for repairing the oil-contaminated saline-alkali soil can be effectively reduced. The oil content of the remedied oil-contaminated so