The invention provides an environment-friendly high-density aqueous woodenware emulsion coating material and a preparation method thereof, belonging to the woodenware coating material technical field. The preparation method comprises the following steps that: firstly, an ordinary emulsifier, a buffer and solvent water are fed into a kettle and are heated to a temperature of between 80 and 82 DEG C; an ordinary emulsifier, a polymerisable emulsifier, nuclear monomer and deionized water are placed in another kettle to prepare an emulsion; an initiator solution is added in the kettle and is stirred evenly, and then a preemulsion is added in drops to prepare a seed emulsion; then, shell monomer and an initiator are dripped into the kettle together, and the temperature of the mixture is maintained at 84 to 86 DEG C for 1 hour; then, the mixture is cooled down and ammonia water is added; when the solution is cooled down to 45 DEG C, a crosslinking agent is added, and an aqueous woodenware emulsion is obtained after cooling, filtration and discharge and is fed into a stirring kettle; under the condition of stirring, a solvent, i.e. deionized water, a high boiling point solvent, a wettingagent and a antifoam agent are added in turn and are stirred and then a thickening agent is added to carry out defoaming slowly; and the aqueous woodenware emulsion coating material obtained after filtration and discharge has the characteristics of high hardness, excellent water resistance and solvent resistance and low VOC emission.