The invention discloses automatic billet coating equipment. The automatic billet coating equipment comprises a conveying system, a detecting system, a coating input and output system and a control system. The conveying system comprises a conveying roller bed, a roller bed motor connected with the conveying roller bed, a first guide disc pair and a second guide disc pair. The coating input and output system comprises a coating conveying box, an automatic control switch, an air compressor, a coating conveying pipeline, a gas conveying pipeline and a spray head. The first guide disc pair, a first detection station, a spraying station, a second detection station and the second guide disc pair are sequentially arranged on the conveying roller bed in the conveying direction. The automatic billet coating equipment has an automatic feeding function, and continuity of production can be guaranteed. The automatic billet coating equipment can recognize whether a billet arrives at the place in front of the spray head or not, and unnecessary coating waste is avoided in the continuous production process; and moreover, the automatic billet coating equipment can count the billet, and a user can prepare the billet in advance and carry out corresponding counting. The automatic billet coating equipment can guarantee that the billet is coated completely and can give an alarm when a failure occurs.