Authorization method for controlling use duration of equipment

The invention relates to an equipment use time length authorization method which is characterized in that information is input into a control system interface of equipment to obtain an authorization code and a check code, the authorization code and the check code are input into the equipment, inverse operation is carried out on the authorization code and the check code through an equipment controlsystem, a new authorization date is written into the equipment, and authorization is completed; the input information comprises a device code, a random authorization application code, a device current clock and next authorization time; the random authorization application code is stored in the control system, is checked and acquired by a display interface, has timeliness, can be automatically refreshed in an overtime manner, and can also be manually refreshed; the current clock of the equipment cannot be modified by a user, and if the clock is wrong, the current clock can be authorized afterclock calibration; the nex