A BOOT area code online upgrading method, a heliostat controller and a heliostat

The invention discloses a BOOT area code online upgrading method, a heliostat controller and a heliostat. The method comprises the steps that upper computer remote upgrading software downloads an upgrading file to a BOOT backup area of the heliostat controller; the upgrading file of the BOOT backup area is uploaded to verify whether the upgrading file is damaged or not, and if the upgrading file is damaged, the upgrading file is re-downloaded and updated; The heliostat controller copies the upgrading file of the BOOT backup area to the BOOT area; And data verification is performed on the upgrading files of the BOOT backup area and the BOOT area, calculation is performed to obtain a first file verification code and a second file verification code, and the first file verification code is compared with the second file verification code: if the first file verification code and the second file verification code are the same, the heliostat controller is restarted to realize BOOT area code upgrading. By uploading an