The invention discloses a machining method for a cabinet plate of a solid wood bathroom cabinet and relates to the technical field of sanitary appliance machining. The machining method mainly comprises the following steps: (1) hot-melt paint coating; (2) coating solidification; (3) cutting of a solid plate for the manufacturing of the cabinet plate; (4) waterproof edge banding; and (5) reservation of assembly holes. According to the machining method disclosed by the invention, the solid plate is subjected to roller coating by utilizing self-manufactured hot-melt paint, and thus a coating is formed on the surface of the solid plate; not only does the coating have excellent usage properties such as the waterproof property, the abrasion-resistant property, the corrosion-resistant and the flame-retardant property, but also the moisture content of the solid plate inside the coating can be kept in the stable state; specifically, the moisture is prevented from be absorbed or volatilized along with changes in the outside environment, thereby guaranteeing that the water content of the solid plate can always be in the optimum state set during the machining; and accordingly, the service life of the cabinet plate of the solid wood bathroom cabinet can be prolonged.