Telescopic support foot and support frame

A telescopic support foot, comprising a plurality of telescopic assemblies in cascade, wherein the telescopic assemblies each comprise:

• a telescopic rod (10) with a first end inserted into a second end of a previous-section telescopic rod (10), wherein a next-section telescopic rod (10) is inserted into a second end of the telescopic rod (10);
• a first limiting device (20) connected to the first end of the telescopic rod (10);
• a second limiting device (30) connected to the second end of the telescopic rod (10), wherein the first limiting device (20) on the next-section telescopic rod (10) abuts against the second limiting device (30) of the telescopic rod (10) to limit separation of the next-section telescopic rod (10) from the telescopic rod (10);
• and
• a locking device (40) arranged at the second end of the telescopic rod (10), connected to the second limiting device (30), and configured to lock or unlock the second limiting device (30), wherein the second limiting device (30) is separated from the second end of the telescopic rod (10) when the locking device (40) is in an unlocked state, to enable the next-section telescopic rod (10) to be separated from the telescopic rod (10).