The present invention discloses an accessory case used for containing a tool head, comprising a rectangular case body and a rectangular base body accommodated in the case body, which is characterized in that the case body is provided with a rectangular containing space, the base body is accommodated in the containing space, a containing hole for inserting the tool head is arranged on the base body, the base body can be rotationally connected with the case body and the rotational axial line (Y) of the base body is perpendicular to the longitudinal axial line (X) of the case body. The base body can be rotationally connected with the case body on the basis of designing the case body and the base body as rectangular shape, the rotational axial line can be also perpendicular to the longitudinal axial line of the case body, thus, the accessory case has the advantages of compact structure, small volume, simple operation and convenient storage and fetching for tool head with large length.