A simple hole opener for transplant under a tobacco seedling film comprises a fixed trough and a movable trough, wherein the upper ends of the two troughs are hinged through a shaft pin; the lower ends of the two troughs form a duck bill shape after being closed; notches are formed in the middles of the sharp ends of the duck bill pieces of the two troughs; and the notch edges of the two troughs are closed when the sharp ends of the two troughs are closed. The simple hole opener for transplant under the tobacco seedling film has the advantages that reserved seedling roots can be protected against damage during thinning, and the strength of the hole opener is enhanced.