The utility model discloses a be applicable to first pests occurrence rule viewing device of cigarette workshop tobacco, including cultivateing room and observation ward's device, with the mesh screen interval, it is provided with ventilative mouthful and feed inlet to cultivate the room, the observation ward is provided with the drawer that can open for observe worm attitude and quantity, the ear is carried to the device both sides, is convenient for remove. The utility model discloses simple structure, convenient to use. When the use, observe pests occurrence rule, emergence algebra and the insect pest situation of tobacco first of the ten heavenly stems in 1 year through this device and break out period, be convenient for grasp accurate insecticidal opportunity improvement insecticidal effect, improvement security.