The present invention relates to a prepreg and a producing method thereof. The prepreg of the present invention comprises: a core material in which a first resin material is impregnated; a second resin material laminated on an upper portion of the core material; and a third resin material laminated on a lower portion of the core material. The bonding surface of the second resin material or the third resin material of the upper and the lower portions of the core material with the first resin material has a non-linear bonding interface.
