An acknowledgement information sending method, comprising: • determining (S 101), by a network device, downlink scheduling signaling, o wherein the downlink scheduling signaling is used by the network device to separately schedule first downlink data to a terminal in A time units, A is a positive integer, the first downlink data is downlink data corresponding to acknowledgement information fed back on a same uplink control channel, o wherein the downlink scheduling signaling comprises indication information used to indicate a threshold, and a total quantity of codewords of the first downlink data scheduled by the network device to the terminal in the A time units does not exceed the threshold, o wherein a value of the threshold is determined based on a quantity of hybrid automatic repeat request, HARQ, processes of the terminal, o wherein when the quantity of HARQ processes of the terminal is 8, the value of the threshold determined based on the quantity of HARQ processes is at least one of 2M, 4M, 6M, and 8M; when the quantity of HARQ processes of the terminal is 16, the value of the threshold determined based on the quantity of HARQ processes is at least one of 4M, 8M, 12M, and 16M or at least one of 2M, 4M, 6M, 8M, 10M, 12M, 14M, and 16M, wherein M is a positive integer; and • sending, by the network device, the downlink scheduling signaling to the terminal (S 102). • determining (S 101), by a network device, downlink scheduling signaling, o wherein the downlink scheduling signaling is used by the network device to separately schedule first downlink data to a terminal in A time units, A is a positive integer, the first downlink data is downlink data corresponding to acknowledgement information fed back on a same uplink control channel, o wherein the downlink scheduling signaling comprises indication information used to indicate a threshold, and a total quantity of codewords of the first downlink data scheduled by the network device to the terminal in the A time units does not exceed the threshold, o wherein a value of the threshold is determined based on a quantity of hybrid automatic repeat request, HARQ, processes of the terminal, o wherein when the quantity of HARQ processes of the terminal is 8, the value of the threshold determined based on the quantity of HARQ processes is at least one of 2M, 4M, 6M, and 8M; when the quantity of HARQ processes of the terminal is 16, the value of the threshold determined based on the quantity of HARQ processes is at least one of 4M, 8M, 12M, and 16M or at least one of 2M, 4M, 6M, 8M, 10M, 12M, 14M, and 16M, wherein M is a positive integer; and o wherein the downlink scheduling signaling is used by the network device to separately schedule first downlink data to a terminal in A time units, A is a positive integer, the first downlink data is downlink data corresponding to acknowledgement information fed back on a same uplink control channel, o wherein the downlink scheduling signaling comprises indication information used to indicate a threshold, and a total quantity of codewords of the first downlink data scheduled by the network device to the terminal in the A time units does not exceed the threshold, o wherein a value of the threshold is determined based on a quantity of hybrid automatic repeat request, HARQ, processes of the terminal, o wherein when the quantity of HARQ processes of the terminal is 8, the value of the threshold determined based on the quantity of HARQ processes is at least one of 2M, 4M, 6M, and 8M; when the quantity of HARQ processes of the terminal is 16, the value of the threshold determined based on the quantity of HARQ processes is at least one of 4M, 8M, 12M, and 16M or at least one of 2M, 4M, 6M, 8M, 10M, 12M, 14M, and 16M, wherein M is a positive integer; and • sending, by the network device, the downlink scheduling signaling to the terminal (S 102).