LCP film is the key electronic insulation raw material for the preparation of high frequency FCCL in 5g era. Because LCP material has the dual properties of high liquid fluidity and crystal orientation order, it is very difficult to form LCP film. Only a few companies have the production capacity at present. The LCP special blowing film production line developed by Shanghai Lianjing has the advantages of wide resin processing temperature and small fluctuation of product thickness (within ± 10%). After blowing, the thickness of products can be adjusted online, and the thickness error can be reduced to ± 2 ~ 4%, which ensures the stability of dielectric constant and dielectric loss factor of finished film. The product specification is applicable to 5g products with film thickness below 75 μm.