Disclosed are a resource selection method and apparatus under multiple carriers, a computer device and a storage medium. The resource selection method comprises: determining at least one candidate carrier according to a resource occupancy exclusion result on each carrier; setting a resource on the candidate carrier to be available, performing exclusion according to a sensing result and obtaining a set of available resources; selecting a transmission resource from the set of available resources, and setting a semi-persistent scheduling counter for resource scheduling. The present application provides a resource selection solution reducing half-duplex influence as far as possible, and reducing the impact due to loss of receiving opportunities and the number of skip subframes, and also avoids the problem of too severe power allocation caused by simultaneous transmission with multiple service packets.