A supervision method for a flight state of an unmanned aerial vehicle, which is applied in a supervision server, wherein: the supervision method comprises the steps of: establishing a communication connection with a control terminal of the unmanned aerial vehicle; receiving off-line flight application information sent by the control terminal, wherein the off-line flight application information comprises identity information and off-line flight parameters, wherein the identity information comprises identity information about a user of the unmanned aerial vehicle; generating, according to the off-line flight application information, an off-line flight certificate for the unmanned aerial vehicle, wherein the off-line flight certificate contains the off-line flight application information; and receiving and responding to a request signal which is sent by the control terminal and used for downloading the off-line flight certificate, and sending the off-line flight certificate to the control terminal, so that the off-line flight certificate is sent to the corresponding unmanned aerial vehicle by the control terminal, thereby restricting flight behaviour of the unmanned aerial vehicle in an off-line flight mode according to the off-line flight certificate, wherein after the step of receiving off-line flight application information sent by the control terminal, the method further comprises: establishing a communication connection with a third-party authentication platform, and sending the identity information about a user of the unmanned aerial vehicle to the third-party authentication platform for authentication; and if the third-party authentication platform successfully authenticates the identity information about a user of the unmanned aerial vehicle, generating, according to the off-line flight application information, the off-line flight certificate. establishing a communication connection with a control terminal of the unmanned aerial vehicle; receiving off-line flight application information sent by the control terminal, wherein the off-line flight application information comprises identity information and off-line flight parameters, wherein the identity information comprises identity information about a user of the unmanned aerial vehicle; generating, according to the off-line flight application information, an off-line flight certificate for the unmanned aerial vehicle, wherein the off-line flight certificate contains the off-line flight application information; and receiving and responding to a request signal which is sent by the control terminal and used for downloading the off-line flight certificate, and sending the off-line flight certificate to the control terminal, so that the off-line flight certificate is sent to the corresponding unmanned aerial vehicle by the control terminal, thereby restricting flight behaviour of the unmanned aerial vehicle in an off-line flight mode according to the off-line flight certificate, wherein after the step of receiving off-line flight application information sent by the control terminal, the method further comprises: establishing a communication connection with a third-party authentication platform, and sending the identity information about a user of the unmanned aerial vehicle to the third-party authentication platform for authentication; and if the third-party authentication platform successfully authenticates the identity information about a user of the unmanned aerial vehicle, generating, according to the off-line flight application information, the off-line flight certificate. establishing a communication connection with a third-party authentication platform, and sending the identity information about a user of the unmanned aerial vehicle to the third-party authentication platform for authentication; and if the third-party authentication platform successfully authenticates the identity information about a user of the unmanned aerial vehicle, generating, according to the off-line flight application information, the off-line flight certificate.