An indoor air purification system based on a great number of plants and a formation method thereof. The system comprises a simulation tree-shaped plant culture device. The simulation tree-shaped plant culture device comprises a trunk member (1), flower water culture devices (2) and connecting members. The top of the trunk member (1) is connected with primary branch members (3). Each flower water culture device (2) comprises a liquid storage tank (4). Culture tank insertion holes (6) are formed in the liquid storage tank (4). A culture tank (7) is arranged in each culture tank insertion hole (6). A water inlet hole (8) is formed in the culture tank (7). Plants (9) for purifying indoor air are cultured in each culture tank (7). By using the characteristic that particulate matters (PM) 2.5 carry cations and plant leaves emit anions and culturing the plants indoors by using the simulation tree-shaped plant culture device, the indoor air purification system based on a great number of plants has the advantages that the anions can be combined with the cations to destroy the characteristic that PM2.5 can be suspended in air for a long term, PM2.5 are settled to the ground and the content of the PM2.5 in the indoor air is reduced.Linvention concerne un système de purification dair dintérieur, basé sur un grand nombre de plantes, et son procédé de formation. Le système comprend un dispositif de culture de simulation de plante en forme darbre. Le dispositif de culture de simulation de plante en forme darbre comprend un élément de tronc (1), des dispositifs de culture deau de fleur (2) et des éléments de raccord. La partie supérieure de lélément de tronc (1) est reliée à des éléments de branche principaux (3). Chaque dispositif de culture deau de fleur (2) comprend un réservoir de stockage de liquide (4). Des trous dintroduction de réservoir de culture (6) sont formés dans le réservoir de stockage de liquide (4). Un réservoir de culture (7) est agencé dans chaque trou dintroduc
