As a new type of temporary structure system, the sockettype tubular steel formwork supported system was widely used in all kinds of projects with the feature of high strength supporting system and fast construction speed. In order to balance the security and economy of this kind of supporting system, the risk analysis model was proposed based on the structural reliability analysis and fuzzy set theory. The significant failure modes were analyzed, and the reliability index was obtained by the Monte Carlo simulation method and the interpolation technique. Making the failure probability and the coefficient of failure loss cost to be asymmetric triangular fuzzy number, risk analysis model of sockettype tubular steel formwork supporting system was presented. The results of one case study show that the risk analysis model is realistic and feasible.