The invention relates to a risk early warning method for a bow anchor device of a rolling transport ship which carries out risk early warning according to the following steps when discovering the bow anchor device of a rolling transport ship is abnormal: step one: confirming the fault mode to be which one of the followings that includes as follows: the positive and negative of the bow anchor are not rotating; the bow anchor has positive and has no negative or reverse; the bow anchor has positive low speed and has no middle and high speeds and the brake of the bow anchor loses effects according to the information of each device collected in real time by the sensors arranged at each measuring point of the bow anchor device of a rolling transport ship as well as the device running and fault information of the devices obtained by manual clearing; step two: confirming the risk early warning flows aiming at the mode of the generated fault and then carrying out risk early warning according to the corresponding diagnosis flows. When not in use, the method of the invention can provide reasonable basis for the daily repairing and maintenance of the bow anchor device of a rolling transport ship.