The invention discloses a splicing support mechanism for outdoor floors. The splicing support mechanism comprises a support mechanism connecting plate, upper press plates, upper locking nuts, splicingsupport pieces, earth studs and connecting plate adapter sleeves, wherein mounting grooves for mounting the earth studs are formed in the surface of the support mechanism connecting plate equidistantly, the earth studs are mounted in the mounting grooves and mounted on the ground in a screwing manner, a lower locking nut is mounted on the lower surface of each earth stud in a screwing and sleeving manner, and a lower press plate mounted on the surface of each earth stud in a sleeving manner is arranged at the upper part of each lower locking nut and propped against the lower surface of the support mechanism connecting plate. According to the splicing support mechanism for the outdoor floors, the separate floors can be spliced into a whole, the problem of sinking or inclining of one flooris solved, and the floors can be lifted by the earth studs and the support mechanism connecting plate and are prevented from being contacted with the ground directly.