The utility model provides a semi-automatic sextant. The semi-automatic sextant comprises a rocking handle, a drum wheel and the like and further comprises an intelligent device, wherein the input end of the intelligent device is connected with the rocking handle and the drum wheel; and the output end of the intelligent device is connected with a display device and a communication interface. The sextant can be used for automatically calculating an included angle of a current measured object in real time while the object is manually aimed and measured, and a measurement result is directly displayed through the electronic display screen and can be also transmitted to other electronic equipment, such as a PC (Personal Computer), through the communication interface so as to be provided for other data operations.