The invention provides a method for monitoring offset and offset direction of a riser. The method comprises the following steps of selecting N monitoring points along the riser, uniformly distributing three strain sensors at the outer wall of the riser for each monitoring point along the axial direction of the riser, solving the maximum strain and the angle between the offset direction and the reference direction of each monitoring point, sequencing the maximum strains of the monitoring points, obtaining the maximum bending strain sequence, building the whole bending strain of the riser, and finally calculating the offset and inclining angle of the riser. The method has the advantages that the cost is saved, the efficiency is improved, and the complexity of monitoring operation is decreased.