The invention provides an active remote attestation method for the measurement of a cloud platform virtual machine. The active remote attestation method comprises the active operation process of a remote attestation client-side and the server trusted authentication process of a cloud management side, wherein static measurement is carried out after the cloud platform virtual machine is started, periodic dynamic measurement is carried out after running, active remote attestation is carried out after measurement is finished, and measurement values and measurement reports are obtained by the cloud management side and then the measurement values are compared with reference values to authenticate whether the state of the virtual machine is changed or not. The traditional passive remote attestation method is changed by the method, the remote attestation client-side is actively triggered by a measurement module, the measurement results are sent to the cloud management server side in real time, and the measurement values do not need to be stored in a PCR of a TPM, so that a remote attestation problem about the dynamic varied measurement and the regular dynamic measurement of the virtual machine in the cloud platform is solved.