The utility model relates to a lightning protection arrester suitable for transformer substation's building, this arrester set up on the parapet of roofing, adopt fenestral fabric, it is including the horizontal hot -galvanize band iron that sets up, vertical hot -galvanize band iron and hot -galvanize round steel that sets up, the horizontal hot -galvanize band iron that sets up is followed the parapet surface inside and outside both sides length direction set up, is located two between the horizontal hot -galvanize band iron that sets up, the interval is provided with a plurality ofly vertical hot -galvanize band iron that sets up, adjacent two interval between vertical hot -galvanize band iron that sets up is 0.8m, hot -galvanize round steel one end with the horizontal hot -galvanize band iron that sets up is connected, and other end setting is in in the parapet, follow parapet constructional column direction is set to the downlead, draws to connect to main ground net. The utility model discloses cause the impaired scheduling problem of concrete layer in the time of avoiding influencing transformer substation's outer facade aesthetic property of building and thunderbolt, be applicable to the building lightning protection of transformer substation.