Depth finder folding and unfolding device for surveying and mapping

The utility model discloses a depth finder folding and unfolding device for surveying and mapping, and relates to the technical field of folding and unfolding devices, in particular to a depth finder folding and unfolding device for surveying and mapping, which comprises a fixed table, a telescopic sleeve and a first servo motor, the telescopic sleeve is fixedly mounted on the upper surface of the fixed table, and the first servo motor is fixedly mounted on the right side of the telescopic sleeve. A gear is fixedly installed on an output shaft of the first servo motor, and one side of the gear is engaged with a rack. According to the depth finder winding and unwinding device for surveying and mapping, a first servo motor is started to drive a gear to rotate, the gear can drive a rack to drive, then the rack drives a take-up box to move downwards, a second servo motor is started to drive a take-up wheel to rotate for paying off, and a detection head enters water for detection; the protection frame can be limit