The invention relates to a protective maintenance device of reservoir automation equipment, in particular to a pull-out type protective maintenance device. The pull-out type protective maintenance device comprises a lower plate seat, an upper cover part and a locking part, wherein the lower plate seat comprises a lower plate seat frame and angle steel B, the lower plate seat frame is installed above a position where automation equipment is placed on a reservoir dam body, the angle steel B is connected to one end of the lower plate seat frame, and the other end of the lower plate seat frame isof an open structure; and the upper cover part comprises an upper cover seat and a fire board, wherein the upper cover seat is provided with an upper cover seat frame, the fire plate is placed in theupper cover seat frame, the upper cover seat frame is arranged in the lower plate seat frame and is in sealing contact with the lower plate seat frame, one end of the upper cover seat frame is inserted into the angle steel B, and the other end of the upper cover seat frame is locked with the lower plate seat frame through the locking part. The pull-out type protective maintenance device adopts a hollow structure, and additional space is not occupied; and the pull-out type protective maintenance device is divided into two parts of the lower plate seat and the upper cover part, the lower plate seat is tightly connected with a equipment foundation, the two parts of the lower plate seat and the upper cover part are in flexible connection through a sealing rubber strip, and the sealing effect is good.