The invention relates to a film flocking type flaky high-elastic warmth-keeping material and a preparation method thereof, belonging to the technical field of textiles. An upper flocked film substrate and a lower flocked film substrate are respectively solidified on the opposite surfaces of a fiber mesh on the upper layer and a fiber mesh on the lower layer of the flaky high-elastic warmth-keeping material; flocks are clamped between the upper flocked film substrate and the lower flocked film substrate; and two ends of the flocks are respectively solidified on the surfaces of the upper flocked film substrate and the lower flocked film substrate. The preparation method comprises the following steps of (1) preparing before flocking; (2) preparing fiber meshes; (3) carrying out hot pressing and laminating; (4) gluing; (5) carrying out electrostatic flocking; (6) drying; (7) absorbing flocks; (8) compounding the fiber meshes; (9) drying; and (10) winding. Compared with the prior art, the flaky high-elastic warmth-keeping material prepared by using the preparation method is good in elasticity and warmth-keeping property.