The invention discloses an interplanting method of arenga pinnata trees. The interplanting method mainly comprises the following steps of land preparation, seedling selection, determination of planting time, planting treatment, planting method, fertilization method, field management and fruit harvesting. Through the interplanting method of arenga pinnata, sesame and pogostemon cablin, the use ratio of land is effectively improved; in addition, through interplanting of the arenga pinnata, the sesame and the pogostemon cablin with different root systems, different layers of nutrients in the soilcan be utilized, the use ratio of the soil nutrients is improved, meanwhile the sesame and the pogostemon cablin separately use different microelements in the soil, and accordingly the trend of soilinfertility is slowed down.