The invention discloses a traffic sign plate device. The traffic sign plate device comprises an integrated rising and falling frame provided with a base, a fixed plate arranged at the upper part of the left side of the rising and falling frame and a sign plate arranged above the fixed plate, wherein a rising and falling device is arranged in the rising and falling frame and comprises a rising andfalling groove formed in the rising and falling frame and a rising and falling block arranged in the rising and falling groove in a manner of moving up and down; first sliding and pushing cavities with front ends and rear ends which are communicated with each other are correspondingly formed in the left side and the right side of the bottom of the sign plate; a through groove is formed between twosliding and pushing cavities; a first sliding and pushing block is mounted in each sliding and pushing cavity in a manner of moving up and down; a dovetail groove with a front end and a rear end which are communicated with each other and a downward open end is formed in each first sliding and pushing block; a regulation groove is formed in the upper end of each dovetail groove; an insertion holecommunicated with the outer end is formed in the bottom wall of each sliding and pushing cavity; a junction plate is mounted in the through groove in a manner of moving up and down; two ends of the junction plate are fixedly connected with the two first sliding and pushing blocks.