The invention relates to a construction method of an immortalized telocytes system. The construction method comprises the following steps: (1) digesting shorn off mouse lung tissue block in type-II collagenase, carrying out filtering and centrifuging, collecting cyte precipitate, culturing the cyte precipitate in a culture medium, after fibrocytes are attached to a wall, transferring supernate to another culture dish, culturing for 12 hours, then changing liquid, and continuing culturing for 3-5 days; (2) taking a trace spearhead as a cyte scraper to scrape off the fibrocytes, and after scraping off the fibrocytes repeatedly, observing a specificity structure telopode and identifying telocytes by an immune marker; and (3) taking the telocytes as host cells, infecting the host cells by using a retroviral vector which contains SV-40-large tumor antigen, and carrying out passage, screening and identifying. Even if the immortalized telocytes system is cultured to the 50th generation, the state is still stable, and therefore, the problem that the purity and the stability of the telocytes cannot be guaranteed by repeated separation and extraction in the prior art.