采用泰勒法制备了直径范围在30~100μm之间的玻璃包裹Ni-Mn-In-Co合金纤维。利用综合物性测量系统(PPMS)研究了磁场对制备态和退火态纤维马氏体相变温度的影响,并且从M-B曲线中分别计算得出了制备态和退火态纤维的磁热效应。研究结果表明:制备态纤维在室温下为7M马氏体结构。在制备态和退火态纤维中,奥氏体相变开始温度随外加磁场变化速率(ΔAs/ΔB)分别为-1.6和-4 K/T。退火态纤维在As点附近发生磁场诱发马氏体向奥氏体逆相变。退火态纤维最大磁熵变为3.0 J/(kg·K),远大于制备态纤维的0.5 J/(kg·K)。Ni-Mn-In-Co合金纤维的大磁熵变和低成本使其成为最具潜力的磁制冷材料之一。 Glass-encased Ni-Mn-In-Co alloy fibers with diameters in the range of 30 ~ 100μm were prepared by Taylor method. The effect of magnetic field on the martensitic transformation temperatures of prepared and annealed fibers was studied by the comprehensive property measurement system (PPMS). The magnetocaloric effect of prepared and annealed fibers was calculated from M-B curves. The results show that the prepared fiber has a 7M martensite structure at room temperature. In the as-prepared and annealed fibers, the onset temperature of austenite transformation with applied magnetic field (ΔAs / ΔB) was -1.6 and -4 K / T, respectively. Annealed fiber in the vicinity of As point magnetic field induced martensite reverse austenite transformation. The maximum magnetic entropy of annealed fibers changed to 3.0 J / (kg · K), which was much larger than 0.5 J / (kg · K) of prepared fibers. The large magnetic entropy change and low cost of Ni-Mn-In-Co alloy fiber make it one of the most potential magnetic refrigeration materials.