The invention discloses an improved-type letter box device. The improved-type letter box device comprises a letter box body and a mounting assembly which is used for fixing the letter box body, a storage cavity is formed in the letter box body, an upper opening and a lower opening which are communicated with the outer end are formed in the right end wall of the storage cavity, an outward opening door is rotatably installed on the lower opening through hinges and is provided with a lockset used for locking the outward opening door, a first sliding cavity which extends transversely is formed inthe upper end of the front end wall and the rear end wall in the storage cavity, a sliding block is transversely and slidably installed in the first sliding cavity, a horizontal plate and a slant plate are fixedly installed in the storage cavity, the horizontal plate is located at the left end of the center of the storage cavity, the slant plate is located at the upper right portion of the horizontal plate, gaps are formed in the vertical plane of the horizontal plate and the slant plate, a push plate is fixed to the lower end face of the sliding block, and the lower end of the push plate abuts against the upper end face of the horizontal plate.