Splicing device and method for steel structure house

The invention discloses an assembling device and method for a steel structure house. The assembling device comprises a connecting bottom plate, and fixed right-trapezoid blocks and movable right-trapezoid blocks sliding relative to the fixed right-trapezoid blocks are arranged on the two sides of the connecting bottom plate; each movable right-trapezoid block is provided with a transverse fastener and a vertical fastener, wherein the transverse fastener is used for penetrating through the I-shaped steel to be connected with the fixed right-trapezoid block, and the vertical fastener is connected with the connecting bottom plate. The transverse fastener penetrates through the I-shaped steel to connect the fixed right trapezoid block and the movable right trapezoid block so as to fix the web position of the I-shaped steel, the vertical fastener fixes the position of the movable right trapezoid block on the connecting bottom plate, and the connecting bottom plate bears component force in the direction of the web