Abstract: A new type of pneumatic precision plastic film mulching planter integrates three advanced cultivation techniques: covering plastic film over the seed bed, deep applying fertilizer and dropping single kernel seed into the seed bed through the hole punched on the plastic film． The functions such as seed bed levelling, furrowing, fertilizer deep applying, plastic film mulching, punching holes on the plastic film,dibbling seed through the holes on the plastic film covering earth on the both　of edges of the plastic film and over the holes borne seed will be accomplished in one operation procedure. It is applicable for the seeding work of corn, cotton and soya　bean etc with　high　seedling rate.　The mechanism,principle of operation and the theoretical basis of design　of this machine are discussed in this paper.