Disclosed are a β-crystal form nucleating agent composition for polypropylene and an application thereof. The composition is prepared by proportionally mixing barium tetrahydrophthalate, calcium tetrahydrophthalate and the like with adjuvants, such as hydrotalcite or calcium carbonate. The composition has better functions than a single-component β-nucleating agent. The impact strength of polypropylene subjected to nucleation modification by the β-crystal form nucleating agent composition can be improved by up to 6 times, and the heat distortion temperature is improved by about 10° C. to 20° C.; in addition, while the impact strength is improved, the flexural modulus of polypropylene can be improved, namely, the rigidity of polypropylene is improved. Therefore, the mechanical and thermal properties of polypropylene are improved. The use amount of the composition is low, and the application range of polypropylene is expanded; the β-crystal form nucleating agent composition for polypropylene can be widely used in the processing application of polypropylene resin.