The invention discloses an elevator lading door mechanism. The mechanism comprises an upper ridge rack body, a door guide rail, an active door board, a passive door board, a rope returning wheel assembly and a steel wire rope; the active door board and the passive door board are arranged on the door guide rail which is in fixed connection with the upper ridge rack body, the active door board and the passive door board are respectively connected with the steel wire rope through steel wire rope clamps, respectively connected with the door guide rail through a change gear and respectively connected with the bottom of the door guide rail through an upper pressure roller, the bottom of the door guide rail is provided with baffle plates that are arranged between the upper pressure roller and door boards, and gaps are provided between the baffle plates and the upper pressure roller as well as the door boards. According to the invention, baffle plates are provided between the upper pressure roller and the door boards so as to limit and protect the upper pressure roller in a horizontal direction, which enables the door boards not to leave the door guide rail when the door boards suffer from great impact, thereby substantially improving safety performance and ensuring safety of passengers.