A data transmission method, wherein the method comprises: receiving, by a network device, first request information that is sent by a first terminal device on a first request transmission resource, wherein the first request information is used to request to use a first data transmission resource, the first data transmission resource belongs to periodic data transmission resources preconfigured by the network device for the first terminal device, the periodic data transmission resources are used to transmit uplink data, the first request transmission resource belongs to periodic request transmission resources preconfigured by the network device for the first terminal device, and the periodic request transmission resources are used to transmit request information; sending, by the network device, first authorization response information to the first terminal device on a first authorization transmission resource, wherein the first authorization response information is used to indicate that the first terminal device can use the first data transmission resource, the first authorization transmission resource belongs to periodic authorization transmission resources preconfigured by the network device for the first terminal device, and the periodic authorization transmission resources are used to transmit authorization response information; receiving, by the network device, uplink data that is sent by the first terminal device on the first data transmission resource; sending, by the network device, first indication information to a second terminal device, wherein the first indication information is used to indicate a first target transmission resource, and the first target transmission resource comprises the periodic data transmission resources and the periodic authorization transmission resources that are preconfigured by the network device for the first terminal device; and receiving, by the network device, uplink data that is sent by the second terminal device on a second data transmission resource, wherein the second data transmission resource belongs to the periodic data transmission resources, the second data transmission resource corresponds to a second authorization transmission resource in the periodic authorization transmission resources, when the network device has not sent the authorization response information on the second authorization transmission resource. receiving, by a network device, first request information that is sent by a first terminal device on a first request transmission resource, wherein the first request information is used to request to use a first data transmission resource, the first data transmission resource belongs to periodic data transmission resources preconfigured by the network device for the first terminal device, the periodic data transmission resources are used to transmit uplink data, the first request transmission resource belongs to periodic request transmission resources preconfigured by the network device for the first terminal device, and the periodic request transmission resources are used to transmit request information; sending, by the network device, first authorization response information to the first terminal device on a first authorization transmission resource, wherein the first authorization response information is used to indicate that the first terminal device can use the first data transmission resource, the first authorization transmission resource belongs to periodic authorization transmission resources preconfigured by the network device for the first terminal device, and the periodic authorization transmission resources are used to transmit authorization response information; receiving, by the network device, uplink data that is sent by the first terminal device on the first data transmission resource; sending, by the network device, first indication information to a second terminal device, wherein the first indication information is used to indicate a first target transmission resource, and the first target transmission resource comprises the periodic data transmission resources and the periodic authorization transmission resources that are preconfigured by the network device for the first terminal device; and receiving, by the network device, uplink data that is sent by the second terminal device on a second data transmission resource, wherein the second data transmission resource belongs to the periodic data transmission resources, the second data transmission resource corresponds to a second authorization transmission resource in the periodic authorization transmission resources, when the network device has not sent the authorization response information on the second authorization transmission resource.