The utility model discloses a dismountable fender that encloses for building site, including the baffle and with baffle fixed connection's fixed bolster, the fixed bolster includes two stands, is equipped with the crossbeam between the stand, be equipped with bracing piece and head rod on the heel post, be equipped with on the opposite side stand with head rod assorted second connecting rod, opposite side stand lower extreme is equipped with the stand connecting seat, upper end of the support bar and stand swing joint, the bracing piece lower extreme is equipped with and supports stem adaptor. The utility model discloses a whole fixing base is fixed to the stand connecting seat, utilizes the bracing piece to support from the back is further whole fixing base, has increased its firm nature, connection through head rod and second connecting rod realizes enclosing between the fender, its simple structure, the easy dismantlement. The utility model discloses can satisfy to enclose and keep off safe firm requirement, but convenient and fast ground installation again, and reuse rate is high, has reduced construction cost.