The invention discloses a wall-mounted indicating lamp of a large refrigeration house. The wall-mounted indicating lamp comprises a wall paster. A first protruding sheet and a second protruding sheet are arranged on the wall paster. An inwards concave channel is formed between the first protruding sheet and the second protruding sheet. A lampshade is arranged in the inwards concave channel. A light source is arranged in the lampshade. A plurality of fixed screw holes are further formed in the wall paster. The wall paster, the first protruding sheet and the second protruding sheet are integrally formed. The first protruding sheet and the second protruding sheet are parallel to each other. The lampshade is made of tempered glass and is of a double-layer structure. According to the wall-mounted indicating lamp of the large refrigeration house, the illuminating lampshade is arranged between the two protruding sheets, the external compacts cannot directly act on the surface of the lampshade when borne, the lampshade is safe even though the indicating lamp is arranged at a lower position, and the use range is wider. A double-layer tempered glass structure is adopted in the indicating lamp, so that cold resistance is greatly improved, and the service life of the indicating lamp is prolonged.