Understanding of the tensile creep behavior of early-age low-calcium fly ash-based geopolymer concrete can provide reference for stress analysis and crack prediction of tensile concrete. A self-design testing set-up was used to obtain the creep behaviors of concrete such as the creep and creep growth rate under the constant tensile stress. The effects of different initial loading ages (2d, 3d and 4d) on the behavior of tensile creep of early-age low-calcium fly ash-based geopolymer concrete were investigated. The results show that the condition of high temperature sealing curing can make the low-calcium fly ash-based geopolymer concrete reach the strength stability in a short time. The creep characteristics of the low-calcium fly ash-based geopolymer concrete are similar to those of the ordinary cement concrete. The initial creep growth rate is faster, and it decreases rapidly with time. Under the same stress-strength ratio of applied load, the larger the initial loading ages, the smaller the specific creep, and the smaller the creep growth rate at the initial stage of loading. The initial loading age has greater effect on the initial stage of loading compared with the mid and final stages.