The invention discloses a novel letter box device. The novel letter box device comprises a machine frame, a machine platform is fixedly arranged at the upper end of the machine frame, a first slidingcavity with the opening end facing left and a second sliding cavity with the opening end facing right and located above the first sliding cavity are formed in the machine platform, a communicating first connecting groove is formed between the first sliding cavity and the second sliding cavity, and the first sliding cavity and the second sliding cavity are separately and internally provided with afirst sliding connecting block and a second sliding connecting block in a sliding connecting mode. A first toe joint strip and a second toe joint strip are separately arranged on the opposite end faces of the first sliding connecting block and the second sliding connecting block, the first connecting groove is internally and rotatably provided with a first toe joint wheel connected with the firsttoe joint strip and the second toe joint strip in a matched mode through a first steering shaft, the front end of the first steering shaft is rotatably installed in the front end wall of the first connecting groove, and the rear end of the first steering shaft is connected with a motor fixedly installed in the rear end wall of the first connecting groove in a power mode.