The invention discloses a sofa nail frame device with a precise positioning structure, and relates to the technical field of sofa production, the sofa nail frame device comprises a base plate and a knocking mechanism, the knocking mechanism comprises a transverse plate and a nail box, the transverse plate is located in an inverted T-shaped adjusting notch, and the nail box is fixedly arranged on one side of the upper end of the transverse plate; a rack is fixedly arranged on one side of the inner bottom end of the inverted-T-shaped adjusting notch, a tooth groove meshed with the rack is formed in the side wall of the transverse plate, the rectangular guide rod is vertically and fixedly arranged at the end, close to the nail outlet, of the upper end face of the nail box, the counterweight frame slidably sleeves the outer wall of the rectangular guide rod, and the knocking column is vertically and fixedly arranged on the bottom end face of the connecting block. A counterweight frame quickly slides down along the outer wall of a rectangular guide rod, a knocking column can be driven to quickly fall, nails guided out of a nail outlet can be hammered, the nails can be accurately positioned, meanwhile, the nails can be prevented from being obliquely nailed into a sofa frame, it is ensured that the nails are perpendicular to the surface of the sofa frame and enter the frame, and the service life of the sofa frame is prolonged. And stable binding of the sofa frame is ensured.