An HARQ feedback method of uplink transmission, an apparatus and a receiving method thereof are disclosed and are used for a base station. The HARQ feedback method of the uplink transmission comprises the following steps of through a current unauthorized cell, monitoring data sent by user equipment; according to a monitored result, determining HARQ feedback; and when an assigned feedback subframe does not acquire a usage right of the current unauthorized cell, in the feedback subframe, through other usable unauthorized cells, sending the HARQ feedback to the user equipment, or in a preset time period after the feedback subframe, after the usage right of the current unauthorized cell is acquired, through the current unauthorized cell, sending the HARQ feedback to the user equipment, wherein the feedback subframe expresses a subframe of a fixed sequential position after the user equipment sends the subframe corresponding to the data. In the technical scheme, the HARQ feedback of uplink transmission is performed on the unauthorized cell.