The invention belongs to the technical field of petroleum exploration and development and especially relates to a dynamic monitoring platform for oil saturation based on microscopic rock slices. The technical scheme of the invention is as follows: an automatic control motor realizes the positioning of the observation point of the rock slices fixed on the experimental platform; the setting of a fiber channel realizes the collection of micro ultraviolet spectrum of rock slices; an ultraviolet spectrum generation and collection combined instrument is used for rock sheet image collection; a microcomputer automatic processing system realizes the conversion of spectral peak value and fluid saturation. The platform can be used to study the mechanism of microscopic water displacing oil and the effect of enhanced oil recovery technology in petroleum industry. It can also be used to discuss the fluid flow mechanism under different microstructures. It has the characteristics of high automation and quantitative monitoring and characterization.