The invention discloses a multifunctional board-board welding simulation test device. According to the test technological process, the device comprises a double-end unwinder, a pulling feeding roller, a seven-roller leveler, a steel strip bilateral edge planer, an automatic steel strip centering roller, a delivery roller way, a lap joint delivery charging roller, a lap joint discharging roller, an opening angle adjusting and control device, an extruding and welding device, a pressure maintaining roller, a pulling feeding roller, a shearing device and a discharging rack. A steep strip to be machined subjected to leveling and edge planing is fed into the extruding and welding device through a delivery roller, and simulation tests of the welding process are conducted. According to the multifunctional board-board welding simulation test device, simulation of ratio-frequency welded tube production units and weldability tests of various strip steel new materials can be conducted, the opening angles, extrusion force and inclination angles of strip steel of different materials and specifications can be detected and adjusted, the efficiency of welding technique parameters of a production line is improved, consumption of production raw materials in the debugging process is reduced, the production cost is reduced, and the product research and development cycle is shortened.