The invention provides a mills barrier. The mills barrier comprises a first side stand, a second side stand and a protective guard. The protective guard is simultaneously fixed to the first side stand and the second side stand. A first foot stand is installed at the bottom end of the first side stand, and a second foot stand is installed at the bottom end of the second side stand. The protective guard comprises a first side guard body, a second side guard body, a third side guard body and a fourth side guard body. The first side guard body, the second side guard body, the third side guard body and the fourth side guard body are fixedly connected end to end, and the inner sides of the first side guard body, the second side guard body, the third side guard body and the fourth side guard body are provided with fixing rings correspondingly. Safe air bags are installed on the fixing rings. According to the mills barrier, the safe air bags are installed on a mills barrier body, when the human body pressure is too large and thus the mills barrier body is pushed over, the safe air bags can be timely inflated, personal injury can be effectively prevented, and occurrence of dangerous accidents is reduced; and meanwhile warning can be sent out, and therefore the situation that accident treatment is timely conducted by an on-duty person can be facilitated.