Multifunctional composite phase change film and preparation method thereof

The invention provides a multifunctional composite phase change film, and belongs to the technical field of phase change materials. The composite phase change film is formed by superposing and compounding two or more than two layers of single-layer phase change films according to a certain sequence. The invention also provides a preparation method of the composite phase-change film. The method comprises the following steps of: packaging a phase-change material in an ultrathin film layer to form a single-layer phase-change film; and overlapping and compounding two or more layers of single-layer phase-change films according to a certain sequence to obtain the multifunctional composite phase-change film. The phase-change materials in different temperature intervals are packaged in the films to form the phase-change films, and different films are overlapped and compounded to form the multifunctional composite phase-change film, so that the multifunctional composite phase-change film has phase-change capability in