The invention discloses a traffic sign device convenient to mount and connect. The traffic sign device comprises two locking connecting frames (1) which are symmetrically arranged and two locking driving parts (3) which are symmetrically arranged; each locking connecting frame (1) is composed of a locking frame (12) and a sliding base (11) which is fixedly arranged at the bottom of the right side of the locking frame (12), wherein a guiding sliding groove (110) is formed in the sliding base (11); the bottoms of the locking driving parts (3) are embedded into the guiding sliding grooves (110) and slidably connected with the guiding sliding grooves (110), a transmission rod (111) extending along the two sides of each guiding sliding groove (110) is arranged in the guiding sliding groove (110), each transmission rod (111) penetrates through the corresponding locking driving part (3) and is in threaded connection with the corresponding locking driving part (3), the right side of each transmission rod (111) penetrates through the corresponding sliding base (11), a driving motor (112) is rotatably connected to the right side of each transmission rod (111) in a matched mode, and the outer side wall of each driving motor (112) is fixedly connected with the adjacent side of the corresponding sliding base (11). The traffic sign device is convenient to dismount and mount, high in stability and low in manufacturing cost.