The utility model provides a protection type RH stove alloy charge door structure, it uses the refractory material field to relate to metallurgical steelmaking, including protection brick (1), key brick (2), side wall brick and neck brick (5), the protection brick comprises the arch brick that the polylith level was placed, the arch brick includes that the middle part takes notched arch brick and middle part to have bellied arch brick, take the notched arch brick and have the wedging setting in turn of bellied arch brick, middle part protecting the brick lower part is equipped with the key brick, be equipped with the side wall brick in the outside of key brick, the side wall brick includes right trapezoid side wall brick (3) and rhombus side wall brick (4), be equipped with right trapezoid side wall brick on the upper portion of rhombus side wall brick, the last port and the key brick of right trapezoid side wall brick are " V " shape and combine, the inside of rhombus side wall brick is equipped with the neck brick that combines together, the utility model discloses a block that sediment, air current etc. To the erosion of erodeing of alloy charge door, increase alloy charge door life's purpose.