The invention discloses a method for preparing a kieselguhr/natural rubber composite material, which comprises the following steps of: dispersing silane coupling agent modified kieselguhr by using deionized water, adding the dispersion solution into natural latex, then adding epoxy natural latex serving as a surface modifier into the mixture, continuously stirring the mixture, coagulating the mixture by adding a coagulant, and drying the coagulated mixture to obtain the reinforced kieselguhr/natural rubber composite material. The material is used for preparing medicinal natural latex products, and can meet various requirements for the human body; and the method has simple process and is easy for scale production.