Photovoltaic module dustproof device and roof photovoltaic module

The invention discloses a photovoltaic module dustproof device and a roof photovoltaic module, and belongs to the technical field of photovoltaic supports, the photovoltaic module dustproof device comprises a first mounting cross beam and a second mounting cross beam, and the first mounting cross beam and the second mounting cross beam are provided with a top mounting part and a bottom mounting part, so that laying of resin tiles on the lower side is not affected, and meanwhile, the bottom mounting part is arranged on the first mounting cross beam and the second mounting cross beam. According to the photovoltaic panel supporting device, the photovoltaic panel on the upper side can be integrally supported, the photovoltaic panel can be supported to a certain degree through the clamping assemblies and the supporting plates arranged on the photovoltaic panel supporting device, and therefore the photovoltaic panels at different angles can be fixedly installed conveniently; the horizontal movement of the first sli