Writing case with pen box and pen container capable of being mutually converted

A writing case with a pen box and a pen container capable of being mutually transformed is composed of a panel, an upper part, a middle baffle, a lower part and the like, the upper part and the lower part are connected together through the middle baffle and can vertically move to adjust the height, springs are placed in the upper part and the lower part, and when the springs are not subjected to external force, the writing case shows the shape of the pen container. When the upper part moves downwards, the spring is compressed downwards along with the upper part, grooves are designed in the positions, where the clamping pieces are placed, of the upper part and the lower part corresponding to the clamping pieces in the upper part, and the clamping pieces are clamped through the grooves. The position of the upper part and the position of the lower part are fixed, the writing case shows the shape of a pen box, the clamping piece is opened to leave the groove of the lower part, and at the moment, the spring bounce