The invention discloses a storage resource recycling method under cloud environment, a sharing storage system and a cloud service system. The method comprises the following steps: receiving a resourcerecycling instructing sent by a virtual machine; orderly storing various logic storage addresses in the resource recycling instructions in a register in sequence, wherein a corresponding serial number of each logic storage address is existent in the register, setting the initial value of the serial number n as 1; reading the logic storage address corresponding to the serial number n from the register; recycling a physical storage space of a data block corresponding to the logic storage address with serial number of n through the simple configuration technology; performing 1-adding processingon the serial number n, and judging whether the current serial number n is greater than M; when judging that the current serial number n is less than or equal to M, continuously executing the step ofreading the logic storage address corresponding to the serial number n from the register. Through the technical scheme disclosed by the invention, the storage resource occupied by to-be-deleted file in the virtual machine can be recycled in real time.