Method, system and device for transmitting random downlink packet data and storage medium

Provided in the present invention are a random downlink packet data transmission method, system and device, and a storage medium, the method comprising: a first network device receiving downlink data of a second network device in a radio resource control to-be-activated state, and sending a first message to the second network device, the first message at least comprises a random access resource in a second handshake channel based on four-step random access and allocated to the second network equipment; the second network device accesses the first network device based on the random access resource; the first network equipment identifies the second network equipment according to the lead code of the random access resource, adds a downlink data unit and a feedback time-frequency resource in a protocol data unit of a second handshake channel, and feeds back the downlink data unit and the feedback time-frequency resource to the second network equipment; and after receiving the downlink data unit, the second networ