Lengthened tripod with adjustable height for surveying and mapping

The utility model discloses a height-adjustable lengthened tripod for surveying and mapping, which comprises an outer support and a support leg hinged on the outer support, the top of the outer support is fixedly connected with a guide sleeve, a connecting shaft is in sliding fit in the guide sleeve, the outer wall of the outer support is symmetrically provided with strip-shaped through holes in the length direction, and the strip-shaped through holes are communicated with the guide sleeve. A telescopic frame is arranged in the through hole; the bottom end of the connecting shaft is connected with a top block; a jacking bolt is arranged at the bottom end of the through hole in a penetrating mode, and a screwing wheel is arranged on one side of the jacking bolt. The short force arm rod and the long force arm rod of the telescopic frame are rotationally connected, the short force arm rod at the topmost part of the telescopic frame is rotationally connected with the ejector block, the long force arm rod at the b