Molybdenum　disulfide　(MoS2)/carbon　nanocomposites　are　grown　in　a　polyacrylic　acid　(PAA)　hydrogel　system　via　a　facile　hydrothermal　process　and　carbonization　of　PAA　by　heat　treatment　under　an　argon　atmosphere.　The　content　of　the　MoS2　electrode　material　can　be　controlled　effectively　by　adjusting　the　immersing　time　of　the　MoS2　precursor　with　PAA　hydrogel.　The　MoS2/carbon　nanocomposites　containing　MoS2　nanosheets　are　uniformly　embedded　in　a　3D　interconnected　network　carbon　matrix.　The　unique　network　structure　as　a　nano/microreactor　to　produce　MoS2　nanosheets　contributes　to　suppressing　the　aggregation　of　MoS2　nanosheets　and　improving　the　conductivity　of　nanocomposites.　The　MoS2/carbon　nanocomposites　demonstrate　a　good　cycling　stability　and　superior　rate　performance.