The invention discloses a building construction site personnel efficiency management system and method. The system comprises an intelligent detection terminal worn by a constructor and a local host, Wherein the intelligent detection terminal is used for acquiring physiological status data, environmental status data and on-site construction process of a constructor and uploading the acquired data to the local host; The method has the beneficial effects that the method is used; wherein the intelligent detection terminal is worn on a person; Authentication of constructor identity, Whether safe wear, Physiological indicators such as heart rate and respiration, Activity position and other information, uploading the data to a cloud server and a local computer host; The method comprises the following steps: establishing a mathematical model, analyzing whether a person correctly wears a safety helmet, is in a correct construction position, and has an accident in the body, finally analyzing thelabor state in real time, timely giving an information warning if the conditions of long-time sabotage, illegal operation, border crossing and the like exist, and automatically commanding a field manager to give intervention by a system if the conditions are not corrected.