The present invention provides a cylinder compression spring load test method and system. Cylinder compression springs are passively loaded, and all the symmetrically arranged cylinder compression springs are in a compression working state, so that a load stage force gradient and a spring utilization efficiency are improved and collision of springs and collision of a contact element are avoided; according to the maximum thrust Fmax of a tested electro-mechanical actuator, a cylinder compression spring force gradient f=Fmax/l is calculated, wherein l expresses twice of the maximum displacementof an electro-mechanical actuator lead screw in the formula; according to the required force gradient f, pre-compression amounts of pre-compression springs of a locknut (1) are calculated, namely thelength L1 of a preshrinking first spring and the length L2 of a preshrinking second spring, wherein the L1=L2=l/2; the locknut (1) is regulated to enable the pre-compression amount of the first springand the pre-compression amounts of the second spring to reach l/2; in a condition of the same group of the springs, different load force gradients are achieved, twice initial force gradients are achieved at the greatest extent, the locknut performs position regulation at a screw rod to satisfy zero-position requirements of different actuators; and a pressure sensor is employed to determine that the first spring and the second spring are qualified in index.