The invention discloses a method for improving the surface wettability of an energetic material and the mechanical property of an explosive, and the method is characterized by comprising the following steps: step 1, preparing an alkaline solution with the pH value of 8-11; step 2, dissolving catechol substance in the alkaline solution, wherein the concentration of the catechol substance after dissolution is 0.1g/L-20g/L and the pH value of the completely dissolved solution is still greater than 7; step 3, putting energetic material into the solution prepared in the step 2, and stirring the mixed dispersion liquid by using a stirrer, wherein the stirring time is 0.1h-48h; step 4, carrying out suction filtration cleaning on the stirred dispersion liquid, washing for 2-5 times by using distilled water; and step 5, putting the cleaned material into a drying oven at the temperature of 50-80 DEG C for 1-24 hours to obtain the modified energetic material. The preparation method of the modified energetic material is simple, the uniformity and completeness of the modified energetic material are good, and the wettability is good.