The utility model relates to the technical field of furniture installation, in particular to a whole house customized furniture efficient splicing and accurate positioning auxiliary device, the rear end of the inner side of a rotating frame is rotatably connected with a threaded shaft, the outer side of the threaded shaft is spirally connected with a lifting supporting plate, and the inner side of the right end face of the lifting supporting plate is rotatably connected with a rotating seat; the right end of the rotating seat is fixedly connected with an adjusting frame, the inner side of the adjusting frame is rotatably connected with a two-way screw rod, and the outer side of the two-way screw rod is spirally connected with a clamping plate. According to the wood board splicing device, the two clamping plates can clamp a wood board, after the wood board is clamped, a threaded shaft can drive a lifting supporting plate to move up and down through rotation of a first stepping motor, and therefore the wood board can be automatically and accurately moved to the position where splicing is needed to be conducted for installation; and the manual work is reduced, and meanwhile, the splicing stability and accuracy of the wood boards can be guaranteed.