The invention relates to the technical field of linear guide rail equipment, in particular to a linear guide rail assembly with a protection function for dust at high temperature, which comprises a movable frame, one side of the movable frame is fixedly connected with a driving frame, and the top of the movable frame and the top of the driving frame are fixedly connected with a connecting seat; and one side of the inner wall of the movable frame is movably connected with a first jacking and fixing block, and the other side of the inner wall of the movable frame is movably connected with a second jacking and fixing block. Through the arrangement of the movable frame, the driving frame, the first jacking and fixing block, the second jacking and fixing block, a first connecting block, a second connecting block, a guide rail frame, a damping grain steel plate, a first jacking and fixing spring and a second jacking and fixing spring, stable conveying work of dust can be achieved; a worker firstly places dust needing to be transported in the powder storage box, and at the moment, a motor in the driving frame is started, so that the movable frame and the driving frame integrally move along the guide rail frame.