The invention relates to a rod-wire roll-pass low-temperature controlled-rolling motor power load distribution design method and belongs to the technical field of steel rolling engineering design and production. The method includes the steps: designing a new production line product outline, taking steel grade deformation resistance measured by Gleeble thermal simulation as an input parameter, adopting DEFORM finite element software to simulate each pass of rolling deformation under actual roll pass, performing simulation calculation to obtain rolling force of each pass of biting, rolling and tailing-out, calculating rolling torque, and calculating power of a rolling mill. The method has the advantages that actual distribution difference of deformation temperature of different position points in each rolling pass, actual distribution difference of strain of the different position points in rolling pass, actual distribution difference of strain rate of the different position points in rolling pass and the like are fully considered for calculation of the rolling force. The method is a most accurate method for calculating rod-wire roll-pass low-temperature controlled-rolling motor power at present, so that important and reliable bases are provided for rated power distribution design of the new production line rolling mill and formulation of low-temperature rolling process parameters.