The invention belongs to the technical field of carbon nanometer tubes, and particularly discloses a preparing method for a hydrophilic carbon nanometer tube film. The preparing method includes the steps that alkyl alcohol, alkyl ketone, terminal-hydroxyl-group hyperbranched polymer, ferrocene, thiophene and amino-end-group hyperbranched polymer are mixed to be even in a certain proportion, and mixed liquid is obtained; at the atmosphere of 900 DEG C to 1,200 DEG C and carrier gas (hydrogen or hydrogen-nitrogen mixed gas), the mixed liquid is injected into a tubular reactor at speed of 5 mL/hto 20 mL/h and carbonized, and the product carbon nanometer tube aerogel enters a conveying belt of a collecting box under carrying of hydrogen flow; after the carbon nanometer tube aerogel is collected for a certain time through the conveying belt, the mixed liquid is stopped to be injected, the carrier gas is closed, nitrogen is introduced, and after the temperature of the tubular reactor is reduced to the room temperature, the nitrogen is closed. The film is taken down and compacted, and the hydrophilic carbon nanometer tube film is obtained. The hydrophilic carbon nanometer tube film is simple in technology, and the hydrophilic carbon nanometer tube film prepared with the method can be hopefully used for the field of composite materials, conductive materials and the like.