The invention discloses a lower working table of a bending machine. The working table comprises a main working table and an auxiliary working table, wherein the main working table is used for bearinga workpiece, and the auxiliary working table is used for supporting the main working table; and a pulley assembly is arranged between the main working table and the auxiliary working table, and the auxiliary working table supports the main working table through the pulley assembly. When the bending machining is conducted, the actual bending force required by machining is made to be uniformly distributed in the range of the whole working tables through the pulley assembly, the bending force can also be made to be distributed densely in the middle of the working tables and be distributed sparsely at both ends of the working tables, so that the large deflection generated by the working table under the combined action of the supporting force on both sides and the downward bending force in themiddle is avoided.