The present invention is a flat plate type by separately manufacturing and combining functions such as an external design printing member in the form of a flat plate capable of design printing, a storage unit card receiving unit using a zipper, and an internal functional member that enables the attachment or storage of a mobile phone. A method for manufacturing a smartphone diary case consisting of a combination of an external design printing member and an internal functional member that not only can print various designs on the external design printing member, but also configure the internal functional member to utilize all the functions as a diary case, and It relates to a smartphone diary case produced by this. A preferred embodiment of the present invention comprises the steps of: (a) cutting the fabric to a predetermined size to produce an external design printing member; (b) printing a predetermined design on the outer surface of the external design printing member; (c) It is made to a certain size and is made of a rear cover part on one side, extending from the rear cover part and rotating around the connection part with the rear cover part to cover the rear cover part, and includes a front cover part in which a receiving part is formed, , A step of attaching the outer surface of the part where the rear cover part and the front cover part of the internal functional member are connected to the central part of the inner surface of the external design printing member by producing an internal functional part formed through a camera hole in the rear cover part; made including
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