The invention discloses an automatic oil-spraying device for a baking tray. The automatic oil-spraying device comprises a machine body, wherein a rack is arranged on the machine body, an oil-spraying chamber which is formed by enclosing of an outer cover is arranged on the rack, a baking tray exit which allows a baking tray to enter the oil-spraying chamber is arranged on the oil-spraying chamber, and an automatic oil-spraying device which can spray oil to the baking tray in the oil-spraying chamber is arranged in the oil-spraying chamber. The automatic oil-spraying device for the baking tray is characterized in that the technical problems that an existing oil-spraying device cannot spray oil to the baking tray automatically, an oil gun is required for spraying manually, the worker's labor intensity is large, the human cost is high and the degree of automation is low are solved.