The invention relates to a novel automatic car-resistance barrier which comprises a control box component and a barrier component. The control box component comprises a control box body, a box cover and a side cover, one side of the box cover is mounted on the other top side of the control box body in a hinged manner while the other side is fastened to the other side of the control box body through buckles, the side cover is fittingly mounted on one side, provided with an opening structure, of the control box body, and elastic clips are further arranged on the inner side wall of the control box body; the barrier component comprises a shell, rollers and a deflated pricker component, a multisection shell is connected through connecting pieces in sequence in a hinged manner, joint pins which are horizontally arranged are arranged between two neighboring sections of the shell, a roller mounting plate is mounted at the end portion of each joint pin, the rollers are respectively mounted on the roller mounting plates through rotating shafts, and the deflated pricker components are evenly respectively distributed on upper sides of the shell. The novel automatic car-resistance barrier has the advantages that a car-resistance barrier device can be automatically rapidly unfolded, a deflated pricker can be reserved in a tyre after the tyre is pricked to prevent the broken opening to be closed to be deflated continuously, and the deflated pricker can be remounted to use.