The invention discloses a horizontal multi-angle mining plane similar simulation experimental device and an experimental method. The plane similar simulation experimental device comprises a loading device, a mold filling device, a lifting device, a fixed device and an experimental bench, wherein a rectangular frame is formed on the inner side of the experimental bench, the loading device is fixed to the inner side of the experimental bench, the mold filling device is a cuboid, the lower end of the mold filling device is hinged to the experimental bench, and the lifting device is respectively connected to the upper ends of the experimental bench and the mold filling device. According to the horizontal multi-angle mining plane similar simulation experimental device, the mold filling device is horizontally arranged so as to fill and compact similar materials, so that the filling step is simple, convenient and safe, the workload is small, and templates which form different angles together with the bottom side are arranged, so that similar models of coal and strata can be laid at any inclined angle. The invention aims to provide the mining plane similar simulation experimental device which has the advantages of simplicity, convenience, safety, small workload and high applicability.