A method for unlocking an air conditioning unit, comprising: receiving, by a mobile terminal, debug request for debugging the air conditioning unit; displaying, by a mobile terminal, a first input interface for unit information of the air conditioning unit; inputting, by a user, the unit information in the first input interface; displaying, by a mobile terminal, a second input interface for identity information of user based on the unit information; inputting by a user, the first identity information in the second input interface; sending, by the mobile terminal, the first identity information and the unit information to a server; receiving, by the server, the first identity information and unit information from the mobile terminal;performing, by the server, a verification of the first identity information based on the unit information; controlling, by the server, an authentication counter to perform counting operation, when the verification of the first identity information fails; when a count value of the authentication counter is less than or equal to a preset value, sending, by the server, an identity information obtaining request to the mobile terminal, such that the mobile terminal returns second identity information based on the identity information obtaining request. sending, by the server, an unlocking instruction to the air conditioning unit corresponding to the unit information when the first identity information is verified, such that the air conditioning unit performs an unlocking operation based on the unlocking instruction; characterized in that after controlling an authentication counter to perform counting operation; when the count value of the authentication counter is larger than the preset value, sending, by the server, an image capturing instruction to the mobile terminal, so as to control the mobile terminal to capture image information of an operator of the mobile terminal based on the image capturing instruction and to return captured image information; when the image information is received from the mobile terminal, storing, by the server, the unit information and the image information correspondingly, and resetting the authentication counter. receiving, by a mobile terminal, debug request for debugging the air conditioning unit; displaying, by a mobile terminal, a first input interface for unit information of the air conditioning unit; inputting, by a user, the unit information in the first input interface; displaying, by a mobile terminal, a second input interface for identity information of user based on the unit information; inputting by a user, the first identity information in the second input interface; sending, by the mobile terminal, the first identity information and the unit information to a server; receiving, by the server, the first identity information and unit information from the mobile terminal;performing, by the server, a verification of the first identity information based on the unit information; controlling, by the server, an authentication counter to perform counting operation, when the verification of the first identity information fails; when a count value of the authentication counter is less than or equal to a preset value, sending, by the server, an identity information obtaining request to the mobile terminal, such that the mobile terminal returns second identity information based on the identity information obtaining request. sending, by the server, an unlocking instruction to the air conditioning unit corresponding to the unit information when the first identity information is verified, such that the air conditioning unit performs an unlocking operation based on the unlocking instruction; characterized in that after controlling an authentication counter to perform counting operation; when the count value of the authentication counter is larger than the preset value, sending, by the server, an image capturing instruction to the mobile terminal, so as to control the mobile terminal to capture image information of an operator of the mobile terminal based on the image capturing instruction and to return captured image information; when the image information is received from the mobile terminal, storing, by the server, the unit information and the image information correspondingly, and resetting the authentication counter.