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To develop a kind of gel polymer electrolyte with high ion conductivity, good mechanical strength and thermal stability, polyimide (PI) matrix enhanced cross-linked gel separator is designed and fabricated by a simple dip-coating and heat treatment method.The PI nonwoven substrate provides high-temperature thermal stability for the gel separator and the crosslinked gel part yields enhanced affinity with liquid electrolyte.Besides, the cross-linked polymer network could solve the limitation of long-term durability of the composite separator in battery.The gel separator shows better cyclability and rate capability than the traditional PP separator, implying a promising potential application in high power high safety lithium ion batteries.The preparation process is compatible with the traditional manufacture process of the nonwoven membrane and is easily converted to continuously produce on industrial scale.