The invention discloses an interlocking mechanism for drawers of a tool vehicle, wherein the prior lock blocks are changed into upper lock blocks and lower lock blocks; joint rods are arranged inside a chute and are fixedly connected with a group of the upper lock blocks and an adjacent group of the lower lock blocks; upper lock blocks on the upper end are connected with elastic jacking blocks, and lower lock blocks on the lower end are fixed on upper ends of gag lever posts; and an interlocking device, which comprises an interlocking pin and a first spring propelling the interlocking pin to move towards the middle of an upper lock block and a lower lock block, is arranged on one side between the upper lock block and the lower lock block. When a drawer is in the locking state, the interlocking pin is connected to a bumper pin; when the drawer is withdrawn, the bumper pin of the drawer slips out by passing through the upper lock block and the lower lock block, and the corresponding first spring drives the interlocking pin to enter into a position between the upper lock block and the lower lock block; and because the ratio of the maximum displacement distance of the upper lock blockon the upper end minus the width of the elastic interlocking pin to the diameter of the bumper pin is less than three seventh, the upper lock blocks and the lower lock blocks corresponding to unopened drawers tightly cling to each other, so that other bumper pins can not pass through, thereby achieving the aim of locking other drawers.