The present invention provides an insulation film (100), comprising a film upper layer (101) and a film lower layer (103), wherein both of the film upper layer (101) and film lower layer (103) are made of a PC or PET material, the PC or PET material contains a flame retardant to meet the flame retardance and puncture resistance property thereof; a film intermediate layer (102) located between the film upper layer (101) and the film lower layer (103), the film intermediate layer (102) is made of the blends of PP and/or PE and PC and/or PET; an upper surface of the film intermediate layer (102) is bound together with a lower surface of the film upper layer (101), a lower surface of the film intermediate layer (102) is bound together with an upper surface of the film lower layer (103).