A beam measurement method, a network-side device, a terminal device, and a storage medium are provided. The method includes: sending configuration information to a terminal device, where the configuration information includes information related to channel state information reference signal CSI-RS resources that are used for beam measurement on an unlicensed frequency band UFB; and sending the CSI-RS resource to the terminal device based on the configuration information, so that the terminal device performs beam measurement on the UFB based on the configuration information and the CSI-RS resource.