The invention discloses a novel mailbox device. The device comprises a loading body and a mailbox body which are installed in a wall, an installation groove for installation of the mailbox body is formed in the center of the front end surface of the loading body, a moving and rotating groove is formed in the portion, behind the installation groove, of the loading body, a first clamping plate, a second clamping plate, a third clamping plate and a fourth clamping plate are arranged at the centers of the upper, lower, left and right outer sides of the installation groove respectively, the first clamping plate, the second clamping plate, the third clamping plate and the fourth clamping plate are arranged in a rotational mode through first rotary columns, and all the four first rotary columns extend backward into the loading body and expand into the moving and rotating groove. According to the device, the whole structure is simple, operation of the whole device is safe and reliable, the mailbox body can be effectively installed and fixed, installation and fixing are solid, the steps of installation and disassembly are simple, the practicability is high, and the device is suitable for application and popularization.