The present invention provides a detachable with pedestrian child to sit in a suitcase, including the box, tie rod, sitting component, detachable card position component, pedal component, the top of the box has card position components, card positions, card positionsThe component includes the card position, the card position has a solid slot, the fixed parts include the left solid board, the right fixing plate, the left solid board is connected to the right solid plate through the hierarchical pages.The side is provided with a left card for accommodating the trolley, and the side of the right solid plate is provided with a right card port for the tie rod. The pedal components include the ring, the branches, the left foot pedal, and the right pedal;Folding fixing fascination, conveniently placed on a seat component on the box of the suitcase to facilitate the promotion or pull the box, realize the movement of children and the suitcase.It is convenient for travel, convenient storage at the same time, and can make children walk without hanging, making sitting more safe and comfortable.