A method for automatically establishing a Wireless Fidelity, WIFI, -based local area network among equipment in private cloud, characterized by comprising: Step 1: acquiring, by a server, equipment information reported by a client after the client successfully logs in the server, and storing equipment attribute information and equipment state information of the client according to the equipment information, wherein the equipment attribute information comprises a Service Set Identifier, SSID, of equipment where the client is installed, type and version information of an intelligent system installed in the equipment and WIFI information, and wherein the equipment state information comprises a login state, information about whether the equipment has been in a certain WIFI-based local area network or not and information about whether the equipment is a hotspot in a certain WIFI-based local area network or not; and Step 2: judging, by the server, whether the client has ability to access a WIFI-based local area network which has been established or not according to the equipment information and the state information, and controlling the client to join the WIFI-based local area network if the client has ability to access the WIFI-based local area network which has been established, otherwise judging whether the client has ability to form a new WIFI-based local area network with other client which has logged in the server but has not accessed any WIFI-based local area network or not, and controlling the client to form the new WIFI-based local area network when the server determines that the client has the ability to form the new WIFI-based local area network, wherein the Step 2 comprises: Step 21: searching, by the server, local data to judge whether there is the WIFI-based local area network which has been established or not, executing Step 22 if there is the WIFI-based local area network which has been established, otherwise executing Step 24; Step 22: transmitting, by the server, information of the WIFI-based local area network which has been established to the client to enable the client to join the WIFI-based local area network which has been established, and executing Step 23; Step 23: receiving, by the server, feedback information from the client, judging whether the client has successfully joined the WIFI-based local area network which has been established or not according to the feedback information, executing Step 25 if the client has successfully joined the WIFI-based local area network which has been established, otherwise executing Step 24; Step 24: establishing, by the server, the new WIFI-based local area network; and Step 25: updating, by the server, the equipment state information stored locally. Step 1: acquiring, by a server, equipment information reported by a client after the client successfully logs in the server, and storing equipment attribute information and equipment state information of the client according to the equipment information, wherein the equipment attribute information comprises a Service Set Identifier, SSID, of equipment where the client is installed, type and version information of an intelligent system installed in the equipment and WIFI information, and wherein the equipment state information comprises a login state, information about whether the equipment has been in a certain WIFI-based local area network or not and information about whether the equipment is a hotspot in a certain WIFI-based local area network or not; and Step 2: judging, by the server, whether the client has ability to access a WIFI-based local area network which has been established or not according to the equipment information and the state information, and controlling the client to join the WIFI-based local area network if the client has ability to access the WIFI-based local area network which has been established, otherwise judging whether the client has ability to form a new WIFI-based local area network with other client which has logged in the server but has not accessed any WIFI-based local area network or not, and controlling the client to form the new WIFI-based local area network when the server determines that the client has the ability to form the new WIFI-based local area network, Step 21: searching, by the server, local data to judge whether there is the WIFI-based local area network which has been established or not, executing Step 22 if there is the WIFI-based local area network which has been established, otherwise executing Step 24; Step 22: transmitting, by the server, information of the WIFI-based local area network which has been established to the client to enable the client to join the WIFI-based local area network which has been established, and executing Step 23; Step 23: receiving, by the server, feedback information from the client, judging whether the client has successfully joined the WIFI-based local area network which has been established or not according to the feedback information, executing Step 25 if the client has successfully joined the WIFI-based local area network which has been established, otherwise executing Step 24; Step 24: establishing, by the server, the new WIFI-based local area network; and Step 25: updating, by the server, the equipment state information stored locally.