A method for allocating feedback resources, applied to a terminal device, comprising: receiving feedback resource configuration information sent by a network side; wherein the feedback resource configuration information is used for allocating feedback resources, and the allocation of the feedback resources is limited by a feedback multiplexing granularity; wherein the feedback multiplexing granularity represents a time domain range of a multiplexing window of the feedback information; the time domain range is a half-slot or N symbols, where N is an integer greater than or equal to 1; wherein after receiving the feedback resource configuration information sent by the network side, the method further comprises: determining feedback resources for a downlink transmission based on the feedback resource configuration information; wherein when determining the feedback resources for the downlink transmission based on the feedback resource configuration information, the method further comprises: multiplexing feedback information of at least two downlink transmissions within a same multiplexing window when determining that the feedback resources for the at least two downlink transmissions are of a same feedback multiplexing granularity based on the feedback resource configuration information; and not multiplexing the feedback information of the at least two downlink transmissions when determining that the feedback resource for the at least two downlink transmissions are of different feedback multiplexing granularities based on the feedback resource configuration information; wherein the method further comprises: determining the feedback multiplexing granularity based on a physical layer indication; wherein determining the feedback resources for the downlink transmission based on the feedback resource configuration information comprises: determining that the feedback resources of the feedback information are within a time domain range of one feedback multiplexing granularity based on the feedback resource configuration information. receiving feedback resource configuration information sent by a network side; wherein the feedback resource configuration information is used for allocating feedback resources, and the allocation of the feedback resources is limited by a feedback multiplexing granularity; wherein the feedback multiplexing granularity represents a time domain range of a multiplexing window of the feedback information; the time domain range is a half-slot or N symbols, where N is an integer greater than or equal to 1; wherein after receiving the feedback resource configuration information sent by the network side, the method further comprises: determining feedback resources for a downlink transmission based on the feedback resource configuration information; wherein when determining the feedback resources for the downlink transmission based on the feedback resource configuration information, the method further comprises: multiplexing feedback information of at least two downlink transmissions within a same multiplexing window when determining that the feedback resources for the at least two downlink transmissions are of a same feedback multiplexing granularity based on the feedback resource configuration information; and not multiplexing the feedback information of the at least two downlink transmissions when determining that the feedback resource for the at least two downlink transmissions are of different feedback multiplexing granularities based on the feedback resource configuration information; wherein the method further comprises: determining the feedback multiplexing granularity based on a physical layer indication; wherein determining the feedback resources for the downlink transmission based on the feedback resource configuration information comprises: determining that the feedback resources of the feedback information are within a time domain range of one feedback multiplexing granularity based on the feedback resource configuration information. multiplexing feedback information of at least two downlink transmissions within a same multiplexing window when determining that the feedback resources for the at least two downlink transmissions are of a same feedback multiplexing granularity based on the feedback resource configuration information; and not multiplexing the feedback information of the at least two downlink transmissions when determining that the feedback resource for the at least two downlink transmissions are of different feedback multiplexing granularities based on the feedback resource configuration information; wherein the method further comprises: determining the feedback multiplexing granularity based on a physical layer indication; wherein determining the feedback resources for the downlink transmission based on the feedback resource configuration information comprises: determining that the feedback resources of the feedback information are within a time domain range of one feedback multiplexing granularity based on the feedback resource configuration information.