A positioning assistance data sending method, comprising: receiving, by a positioning server, at least one positioning request sent by a core network device, wherein the positioning request comprises an identifier of user equipment, UE, and an identifier of a serving cell (Cell 1) of the UE; and sending, by the positioning server, at least one piece of positioning assistance data to a base station based on the at least one positioning request; wherein before the sending, by the positioning server, at least one piece of positioning assistance data to a base station based on the at least one positioning request, the method further comprises: receiving, by the positioning server, a first message sent by the UE, wherein the first message comprises at least one of positioning capability indication information, positioning precision indication information, and/or service type indication information of the UE, wherein the positioning capability indication information is used to indicate a positioning capability of the UE, the positioning precision indication information is used to indicate positioning precision supported by the UE, and the service type indication information is used to indicate a service type supported by the UE; wherein after the sending, by the positioning server based on an identifier of the first serving cell (Cell 1), the at least one piece of positioning assistance data to the base station corresponding to the first serving cell (Cell 1), the method further comprises: sending, by the positioning server, a stop indication message to the base station corresponding to the first serving cell (Cell 1), wherein the stop indication message is used to indicate that sending of the at least one piece of positioning assistance data to the base station corresponding to the first serving cell (Cell 1) is stopped. receiving, by a positioning server, at least one positioning request sent by a core network device, wherein the positioning request comprises an identifier of user equipment, UE, and an identifier of a serving cell (Cell 1) of the UE; and sending, by the positioning server, at least one piece of positioning assistance data to a base station based on the at least one positioning request; wherein before the sending, by the positioning server, at least one piece of positioning assistance data to a base station based on the at least one positioning request, the method further comprises: receiving, by the positioning server, a first message sent by the UE, wherein the first message comprises at least one of positioning capability indication information, positioning precision indication information, and/or service type indication information of the UE, wherein the positioning capability indication information is used to indicate a positioning capability of the UE, the positioning precision indication information is used to indicate positioning precision supported by the UE, and the service type indication information is used to indicate a service type supported by the UE; wherein after the sending, by the positioning server based on an identifier of the first serving cell (Cell 1), the at least one piece of positioning assistance data to the base station corresponding to the first serving cell (Cell 1), the method further comprises: sending, by the positioning server, a stop indication message to the base station corresponding to the first serving cell (Cell 1), wherein the stop indication message is used to indicate that sending of the at least one piece of positioning assistance data to the base station corresponding to the first serving cell (Cell 1) is stopped. receiving, by the positioning server, a first message sent by the UE, wherein the first message comprises at least one of positioning capability indication information, positioning precision indication information, and/or service type indication information of the UE, wherein the positioning capability indication information is used to indicate a positioning capability of the UE, the positioning precision indication information is used to indicate positioning precision supported by the UE, and the service type indication information is used to indicate a service type supported by the UE; wherein after the sending, by the positioning server based on an identifier of the first serving cell (Cell 1), the at least one piece of positioning assistance data to the base station corresponding to the first serving cell (Cell 1), the method further comprises: sending, by the positioning server, a stop indication message to the base station corresponding to the first serving cell (Cell 1), wherein the stop indication message is used to indicate that sending of the at least one piece of positioning assistance data to the base station corresponding to the first serving cell (Cell 1) is stopped.