Telescopic supporting device and telescopic supporting post

A telescopic supporting device, comprising:

• a plurality of hollow kits, each of the plurality of hollow kits comprising an outer wall and an inner wall, a plurality of first grooves being provided on the outer wall, a plurality of second grooves being provided on the inner wall, each of the plurality of hollow kits having a same outline but different size, and each of the plurality of hollow kits being sequentially engaged and sleeved within one another, each of the plurality of first grooves and each of the plurality of second grooves being adjacent to each other and alternatively configured on each of the plurality of hollow kits, each of the plurality of first grooves of each of the plurality of hollow kits of inner side being correspondingly combined with each adjacent one of the plurality of second grooves of each of the plurality of hollow kits of outer side to form a plurality of stopper containing parts;
• and
• a plurality of stoppers, disposed in the plurality of stopper containing parts, shapes of cross sections of the plurality of stoppers being corresponding to outlines of the plurality of stopper containing parts;
• wherein the plurality of stoppers prevent the two adjacent hollow kits from generating a relative rotation.