The utility model provides a building site staircass installs protector relates to the architectural equipment field, including a plurality of support frames, the support frame includes strutting arrangement and lower strutting arrangement, go up strutting arrangement and connect through oblique beam column between the strutting arrangement down, still be equipped with fixing device, a plurality of support frame can pile up from top to bottom through fixing device and link together, places in the stair road junctions, the utility model has the advantages of reasonable design, it is fixed firm, and dismantle simple to operate.