Abstract: Superhydrophobic treatment of wood surface is of great significance for overcoming the hydrophilic problem of wood and expanding its application fields. In this paper, based on the adhesion and deprotonation characteristics of polydopamine (PDA) coating, sodium methylsilicate (SMS) was used to etch the PDA coating. Furthermore, octadecyltrichlorosilane (OTS) was used as a low surface free energy agent to prepare stable superhydrophobic wood (Wood@PDA-SMS-OTS). The samples were characterized by contact angle (CA) meter, SEM and XPS respectively. The results show that the maximum static CA of water on the surface of Wood@PDA-SMS-OTS samples is 157.4° and the sliding angle (SA) is 4.3°. SEM images show that SMS successfully etch the PDA coating and hydrolyze to generate hydrophobic oligomeric or semi-polymerized methylsiloxane on the surface of the PDA coating, forming an obvious micro-nano rough structure. XPS analysis shows that PDA forms a uniform coating on the surface of wood. While SMS etchs the PDA coating, its polymer formed by hydrolysis is successfully loaded on the surface of PDA. OTS containing long chain structure is grafted on the surface of wood, which makes the wood realize superhydrophobic. The surface of superhydrophobic wood still has stable superhydrophobicity after 24 h of water scouring, ultrasonic vibration, acid-base corrosion and organic solvent treatment.