Safety signboard

The utility model discloses a safety signboard which comprises a first half body and a second half body, a magnet block is installed on the first half body in a sliding mode, the first half body can be attracted to an iron outer wall through the magnet block, a minimum gap is formed between the magnet block and the iron outer wall, and a first label groove is formed in the first half body; the second half body and the first half body can be spliced together, an insertion plate is arranged on the second half body and can be tightly attached to the iron outer wall and the magnet block, the plate thickness value of the insertion plate is larger than the value of the minimum gap, and a second label groove is formed in the second half body. The first half body is provided with the magnet block, the first half body can be reliably attracted to the iron outer wall of equipment under the condition that the first half body and the second half body are not spliced, when the first half body and the second half body are