The invention discloses a site staff locating system. The site staff locating system comprises a first locating module for obtaining data identification of to-be-located staff, an image obtaining module for collecting video images in a construction site, a second locating module for obtaining second position information of the to-be-located staff according to the video images, a control center foranalyzing and judging the locating conditions of the to-be-located staff according to the data identification and the second position information of the to-be-located staff and generating alarm information according to the locating conditions, a display module for displaying first locating marks and second locating marks of the to-be-located staff on a map according to the data identification andthe second position information of the to-be-located staff, an alarm module for giving an alarm according to the alarm information, and a communication module for communication between all the modules. The invention further discloses a site staff locating method. The position information of all staff in the construction site can be effectively obtained, and the locating accuracy of the staff is improved.