In this research, a simple strategy to prepare superwetted solid particles based on particle size adjustment is proposed. Typical samples, including Ag2O, AgCl, AgBr, Cu2O, Cu(OH)(2), and soot, with different superwettabilities were obtained based on this size-dependent strategy. The acquired superwetted samples without any modification, whether superhydrophilic and superhydrophobic, had the same composition and structure, and their wettability was only decided by the particle size. This size-dependent strategy for preparing superwetted solid particles is universal and promising.