A blow-molded table includes a table board, and two opposite support units each foldably mounted on a bottom of the table board. Each of the two support units includes a support stand pivotally mounted on either one of two ends of the table board, and a support member pivotally mounted on a mediate of the table board and pivotally connected with the support stand. Thus, the blow-molded table is supported rigidly and stably when being expanded and is folded when not in use.