The invention relates to a pipe assembling device for a small-span steel corrugated pipe bridge culvert and belongs to the field of installation of a bridge culvert structure. The pipe assembling device comprises a hydraulic sucker telescopic boom system, a 360-degree turnover horizontal telescopic boom system, a vertical lifting system, an intelligent control system and a walking and fixing supporting system. According to the pipe assembling device, a traditional mechanical control mode and an electric control mode are adopted, quick assembling of small-span steel corrugated pipes is achieved, the assembling efficiency is improved, and the pipe assembling device is applicable to upgrading and reconstruction of a newly-built small-span steel corrugated pipe bridge culvert and an old bridge culvert. According to the pipe assembling technology, the automatic control technology is adopted, continuous and automated assembling of the small-span steel corrugated pipes is achieved, the defect that the traditional manual assembling operation is unsafe is overcome, and the safe use performance of the pipe assembling device is greatly promoted. Components used in the pipe assembling device are all finished products in the prior art or finished products which can be purchased in a market and have no special structural requirements.