A surface treatment apparatus, disposed around a conveying device conveying a substrate in a predetermined conveying direction, includes: first and second liquid nozzles, disposed at an adjustable angle above the conveying device, each having an axial direction perpendicular to an axial direction of the conveying device, in which the second liquid nozzle is spaced apart from the first liquid nozzle by a first predetermined distance in the predetermined conveying direction, and the first and second liquid nozzles incline at a first angle facing each other; and first and second liquid level baffles, disposed on two sides of the conveying device respectively and spaced apart from the conveying device by a gap, in which the first and second liquid level baffles are located within the first predetermined distance spaced apart between the first and second liquid nozzles.