The invention discloses a manufacture process of an automobile nano fireproof heat-insulating felt, comprising the steps of inspecting a fireproof felt, checking if the color of the raw material is uniform or not, and cleaning the surface with no water or oil stain occurring and with no breaking or tearing, or layered structure continuity damage occurring to the surface; tailoring the nano fireproof felt to the standard size, and coating the front and back of the nano fireproof felt with flame-retardant glue; heating the coated fireproof felt, combining a layer of fireproof cloth to each of the front and back of the heated fireproof felt, inspecting the combined product, and storing a warehouse. The manufacture process is suitable for various specifications of fireproof heat-insulating products, requiring fireproofing and heat insulation, of automobile engine compartments, vehicle body sides, floor partitions, new energy battery compartments, exhaust systems and the like; nano voids in the felt can slow down heat conduction, low heat conductivity is provided, and the fireproof cloth for covering enables an automobile to be clean as required.