The invention discloses a fully-automatic production line applied to brake pad production. The production line sequentially comprises a weighing device, a loading device and a plurality of hot presseswhich are arranged in a straight mode from front to rear, wherein a material receiving box is separately arranged at the front side of each hot press; the loading device comprises a cross sliding table which is composed of a beam and a longitudinal beam in sliding connection with the beam; a loading arm is arranged on the longitudinal beam in a sliding mode; a transverse drive mechanism is arranged between the beam and the longitudinal beam; a longitudinal drive mechanism is arranged between the longitudinal beam and the loading arm; the loading arm comprises a loading arm frame body; and a loading mechanism, a spraying mechanism, a flattening mechanism, a cleaning mechanism and a taking-placing mechanism are sequentially arranged in the loading arm frame body from rear to front. The production line can realize automatic production of a brake pad, does not need manual operation throughout the process, and greatly improves production efficiency.