The present invention discloses a compound beta-crystal nucleating agent used for polypropylene processing, which is composed of 100 parts by weight of one or more beta-crystal nucleating agents and 0.0001-1000 parts (preferably 1-200 parts) by weight of one or more synergists. Since the existence of the synergist, a series of high-efficiency low-cost compound beta-crystal nucleating agents are expected to be obtained. The compound beta-crystal nucleating agent is expected to be widely applied in the fields of automobiles, pipelines, films, electrical and electronic appliances, etc.