preparing a mixed aqueous solution of a gel A and a crosslinker under a heating condition, and preparing a tableware mold after cooling;

placing the prepared tableware mold into an aqueous solution of a gel B, and standing to crosslink the gel B and the crosslinker in the tableware mold on the surface of the mold to form a tableware model; and separating the tableware model from the mold, and drying the tableware model after separation, so as to obtain a finished tableware;

wherein

the crosslinker is dispersed in the gel mold formed by the gel A and does not crosslink with the gel A;

a crosslinking reaction occurs between the gel B and the crosslinker;

the gel A is one or more of agar and agarose;

the crosslinker is one or more of calcium chloride, zinc chloride, calcium acetate, zinc acetate, calcium gluconate, zinc gluconate, zinc lactate, calcium lactate, potassium cholride, sodium phytate;

the gel B is one or more of carrageenan, sodium alginate, pectin, gellan gum, and chitosan;

the solution of the gel B contains a plasticizer;

the plasticizer is glycerol;

the concentration of the plasticizer in the solution of the gel B is 10% by weight;

an edible waterproof coating is applied by spraying, dipping or brushing on the inner and/or outer surface of the finished tableware; and

the tableware consisting of: a straw, a cup, a bowl, a dish, and a spoon.