The invention discloses a pot culture process method of a mangrove plant, comprising the steps as follows: a double-layer flowerpot consisting of a transparent externally sleeved flowerpot and a built-in flowerpot is created, tidal flat soil is filled in the built-in flowerpot as growing base, the mangrove plant seedling or the intact embryo is planted in the growing base, the artificial seawater is filled in the flowerpot for culturing the mangrove seedling or the embryo, the artificial seawater is filled in and discharged from the flowerpot per day for culture management of the planted mangrove plant pot by simulating the ebb and flow law of the semi-diurnal tides, and aerating roots are guided and shaped into the required appearance when the mangrove plant grows and forms well-developed aerating roots in the externally sleeved flowerpot. The pot culture process method successfully transplants the mangrove plant into the room for culture and develops into the pot art, combines the indoor air purifying functions with the aesthetic values of the mangrove plant and plays an important role in creating a healthy and comfortable lifting environment for people.