Abstract: A method for preparing a pulp molded cup lid with buckles without overlapping curves on both surfaces, comprising: diluting plant fiber into pulp and placing it into a forming mold with a filter screen to form a paper embryo through vacuum adsorption; assembling the forming mold with a transfer mold under no pressure for vacuumization to obtain a paper embryo; transferring the paper embryo into a heat setting mold without mesh screen and assembling the mold under no pressure to obtain a cup lid body with stiffening ribs; then stamping into a finished cup lid. The cup lid has smooth internal and external surfaces without overlapping curves and no paper fiber dissolved out at the places where the internal surface and the liquid contact and the suction port and the labial part of the user contact; buckles improves the strength of the cup lid and the leakproofness.