The invention discloses a beewax coating device capable of uniformly waxing square table boards and a working method thereof. The device is characterized by comprising an outer connecting body, a linear walking device arranged outside the outer connecting body and a wax melting and brushing device arranged in the outer connecting body; the outer connecting body is a rectangular frame without a top or a bottom; a connecting sleeve is arranged at each of the left end and the right end of the outer connecting body; and the wax melting and brushing device comprises a container provided with an extending body, a beewax melting bin is formed in the container, a heating block bin is formed in in the beewax melting bin, the lower part of the beewax melting bin is connected with a collecting bin, a plurality of discharging pipes are arranged at the lower part of the collecting bin, and a discharging blocking piece is arranged at the lower parts of the discharging pipes. The beewax brushing and making device for the table boards has the beneficial effects of being simple in structure, convenient to use and especially suitable for making beewax for square and large areas, lowers the labor intensity of workers and improves the work efficiency. Wax bodies made by melting in the device have the characteristics that the wax melting is uniform, the wood grain is clear and the brightness is high.