This　study　aims　to　evaluate　the　cracking　resistance　and　sustainability　performance　of　alkali-activated　slag　(AAS)　concretes　incorporating　pre-wetted　lightweight　aggregates　(LWAs).　Three　replacement　rates　(0,　50%,　and　100%)　of　natural　coarse　aggregates　(NAs)　with　pre-wetted　LWAs　are　used,　while　the　ordinary　Portland　cement　(OPC)　concrete　alternatives　are　considered　as　control　samples.　The　results　showed　that　incorporating　pre-wetted　LWAs　effectively　improved　the　cracking　resistance　of　the　AAS　concretes,　and　the　effect　was　more　evident　as　the　LWA　contents　increased.　The　cracking　age　of　the　AAS　concretes　was　delayed　from　5.6　d　to　8.9　d　and　10.6　d　with　50%　and　100%　replacement　of　NAs　by　LWAs,　respectively.　Meanwhile,　a　desirable　result　was　that　the　AAS　concretes　could　still　endure　relatively　high　tensile　stress　after　the　initial　cracking.　The　larger　tensile　stress　could　be　undertook　with　the　increase　in　LWA　contents.　Although　the　incorporation　of　LWA　slightly　increased　the　environmental　burdens　of　the　concrete　alternatives,　the　energy　consumption　and　five　environmental　impact　categories　of　the　AAS　concretes　were　reduced　by　more　than　20%　and　40%,　respectively,　compared　to　those　of　OPC　concretes　with　the　same　LWA　content.　Similar　results　were　found　in　the　calculation　of　life-cycle　cost.　Even　for　the　AAS　concretes　with　100%　LWA　content,　the　significant　environmental　and　economic　benefits　were　still　obviously　obtained　compared　to　the　OPC　concretes　without　LWA.