The invention relates to a linear Fresnel reflector design method for the maximum concentration ratio of a dual-axis tracker. The method includes the following steps: determining the horizontal distance of a first linear Fresnel reflector and a central axis of a heat collector; obtaining the corresponding relation of the included angle between a mirror sheet and a mirror field plane and the included angle of a line between the center of the heat collector and the center of the mirror sheet and the mirror plane according to the reflection law; obtaining the width of the linear Fresnel reflectoraccording to the triangle sine theorem; and determining the horizontal distance of a second linear Fresnel reflector and the central axis of the heat collector according to the horizontal distance ofa first linear Fresnel reflector and the central axis, and so on. Through the accurate calculation of the position parameters, widths and slant angles of each linear Fresnel reflector in the mirror field, the maximum concentration ratio can be realized by maximumly utilizing the space of the mirror field, maximum utilization of sunlight in a confined space can be realized, and heat collecting performance can be enhanced.