The invention relates to a vaporous soil water acquisition measurement system. The vaporous soil water acquisition measurement system is matched a soil sampling device to realize measurement of small-perturbation in-situ vaporous water flux of sandy soil. The basic principle adopts direct measurement, a semiconductor refrigeration module is utilized and a condensing and weighing method is adopted. A heat exchange, temperature control and measurement system is built and is suitable for observation continuously; a soil sample does need to be moved during measurement, and the system is suitable for in-situ observation and can measure water-vapor flux bi-directionally.