Linear driving stretching device for sofa

The invention discloses a sofa linear drive stretching device, and relates to the technical field of sofas, the sofa linear drive stretching device comprises a base and a functional frame, the functional frame is mounted on the top of the base, the functional frame comprises a leg structure, a seat structure and a back structure, the leg structure is connected with the bottom of the seat structure, and the back structure is connected with the bottom of the seat structure. The top of the seat structure is connected with the back structure, meanwhile, a motor is installed in the seat structure, the two ends of the motor are installed in the seat structure through a leg connecting assembly and a back connecting assembly respectively, and in the process of switching the sitting posture, the TV posture and the lying posture through the motor driving device, the leg structure needs to be frequently unfolded or folded; a traditional sliding groove design scheme at a leg supporting position is omitted, a connecting r