The invention discloses a preparation method of a wear-resistant aging-resistant rubber compound filled with a coupling modified wood fiber. The method comprises the steps of mixing oxygenated black,formaldehyde and a sodium hydroxide water solution, carrying out stirring reflow reaction under the nitrogen atmosphere, filtering, water washing to be neutral, drying to the constant weight, and obtaining hydroxymethylation modified carbon black; adding a silane coupling agent into an ethanol solution, uniformly stirring and mixing, adding a wood fiber, carrying out modification treatment in water bath, taking out for air drying, drying in a drying oven, and obtaining the coupling modified wood fiber; feeding multi-functional modified natural rubber into a torque rheometer, adding zinc oxide,stearic acid, an anti-aging agent and an accelerant, mixing, adding zinc methacrylate, a coupling agent modified white carbon black, the hydroxymethylation modified carbon black and the coupling modified wood fiber, and mixing to obtain the rubber compound. By adopting the hydroxymethylation modified carbon black, the coupling modified wood fiber, and the coupling agent modified white carbon black for reinforcing, the wear-resistant aging-resistant rubber compound is prepared.