The invention relates to nut inner pipe automatic assembling equipment for a linear actuator assembly line, and belongs to the technical field of assembling automation. The equipment structure comprises a feeding device, a positioning punching and riveting device, a workpiece lifting device, a screwing device, linear sliding tables and an installing plate. The feeding device, the workpiece liftingdevice and the linear sliding table are fixed to the installing plate, the positioning punching and riveting device and the screwing device are installed on the two same-rail linear sliding table, and a tool plate carries workpieces to move to the position below the installing plate along with a conveying belt. The core function of the automatic assembling equipment is to solve the problems aboutautomatic assembling processes of nut inner pipe screwing, punching and riveting loosening prevention and the like, and the equipment core part is the screwing device. The equipment is simple in structure, and the linear actuator nut inner pipe assembly requirement is met; and meanwhile, the automatic assembling process is achieved, the product assembly quality consistency is improved, and the safety and the production efficiency in the production process are improved.