Manufacturing method of variable-cross-section box type bending and twisting steel member

The invention relates to the technical field of building construction, and discloses a manufacturing method of a variable-cross-section box type bent and twisted steel member. The manufacturing method of the variable-cross-section box type bending and twisting steel component comprises the steps that cutting size data of all wall plates and rib plates are obtained according to a solid model of the bending and twisting steel component; a wooden sample box is manufactured according to the cutting size data; the steel wall plates and the steel rib plates are cut according to the cutting size data, and the steel wall plates and the steel rib plates are rolled and formed according to the bending and twisting rate of the wood sample box; a wood sample box is used for conducting shape pressing inspection on the steel wall plates and the steel rib plates, whether the shape pressing inspection is qualified or not is judged, and if the shape pressing inspection is qualified, the bent and twisted steel components are as