Safety protection device

The utility model belongs to the technical field of road and bridge construction safety protection, and particularly relates to a safety protection device which comprises a plurality of protection plates. Slots which are symmetrically arranged are formed in one side of the protection plate; telescopic grooves which are symmetrically arranged are formed in the insertion groove; a third spring is fixedly connected into the telescopic groove. The other end of the third spring is fixedly connected with a semicircular clamping cap. A worker inserts an insertion block at one end of one protection plate into an insertion groove of the other protection plate, after insertion, a semicircular clamping cap is clamped in a fixing groove formed in the insertion block, so that the protection plates are fixedly connected, a supporting rod is rotated after fixation, a supporting block makes contact with the ground, and under cooperation of a connecting piece and a first spring, the protection plates can be fixed. And when th