Automatic assembling and riveting equipment for plastic part of umbrella stick

The invention discloses automatic assembling and riveting equipment for a plastic part of an umbrella stick. The automatic assembling and riveting equipment for the plastic part of the umbrella stick comprises an umbrella tube conveying mechanism for conveying each umbrella tube, and a small closing knife assembling device, a first push rod device, an elastic piece assembling device, a second push rod device, a large closing knife assembling device, a middle groove assembling device, an outer tooth assembling device, an upper groove assembling device and a material shrinking device which are sequentially arranged in the feeding direction of the umbrella tube conveying mechanism, the small closing knife assembling device installs a small closing knife into a small pipe, the first push rod device pushes a small pipe into a middle pipe, the elastic piece assembling device installs an elastic piece into the middle pipe, the second push rod device pushes the middle pipe and the small pipe into a large pipe and pul