The utility model relates to a signboard fixing clamp. The clamping device comprises a first clamping part and a second clamping part. The first clamping part and the second clamping part are detachably connected; a space for a steel pipe or a concrete pole crawling ladder to penetrate through is formed between the first clamping part and the second clamping part; the size of the space between thefirst clamping part and the second clamping part can be adjusted, the fixing clamp is used for clamping crawling ladders of steel pipes or concrete poles of different types, the fixing clamp is simple in structure and convenient to use, and the signboard can be fixed to the crawling ladders of the steel pipes or the concrete poles of different types.