The invention provides an automatic feeding device of temperature limiter outer cups. The automatic feeding device can automatically deliver the temperature limiter outer cups well arranged by a vibrating tray to an automatic punching female die seat of a conveying belt to achieve full automation of production of the temperature limiter outer cups. The automatic feeding device comprises a conveying belt female die, wherein two sides above the conveying belt female die are provided with a material retaining plate and a feeding belt opening respectively; the material retaining plate is provided with a material retaining cambered surface matched with a side surface of a temperature limiter outer cup; the feeding belt opening is connected with a feeding belt; the feeding belt is connected with the vibrating tray; a rotary deflector rod is arranged at the feeding belt opening; the feeding belt comprises two groups of limiting grooves with equal relative distances; the distance between the two groups of limiting grooves is greater than the diameter of a temperature limiter outer cup main body and is smaller than the flanging diameter of a temperature limiter outer cup rim; each group of the limiting grooves comprises a lower delivery limiting line and an upper delivery limiting line; the lower delivery limiting line is connected with a discharge port of the vibrating tray; and the upper delivery limiting line is suspended relative to the connection part between the lower delivery limiting line and the discharge port of the vibrating tray.