Building pay-off device for engineering surveying and mapping

The utility model relates to the technical field of engineering surveying and mapping equipment, and discloses a building pay-off device for engineering surveying and mapping, which comprises a pay-off device main body, a pay-off wheel is rotatably mounted in the pay-off device main body, a handheld hole is formed in the outer surface of the pay-off device main body, and conical columns are fixedly connected to the tail end of the pay-off device main body at equal intervals; a sliding groove is formed in the pay-off device body, a limiting plate is fixedly connected to the bottom end of the interior of the sliding groove, an adjusting block is slidably connected to the interior of the sliding groove, a pressing block is slidably connected to the interior of the adjusting block, limiting blocks are fixedly connected to the two side faces of the pressing block, and a double-shaft motor is fixedly installed in the adjusting block. A drill rod is fixedly installed at one end of the double-shaft motor through a co