The invention discloses a lubricating device for a hot rolled steel strip rolling technology. An oil supply pump connected with an oil tank is divided into two paths to be respectively connected with an oil supply metering pump, and both oil supply metering pumps are connected with an inlet of a lubricating oil electromagnetic control valve. Feculent circulating water passes through a water filter and is then depressurized by a pressure reducing valve, an outlet of the pressure reducing valve is respectively communicated with a switch, a branch path water filter, a water regulating control valve, the lubricating oil electromagnetic control valve and the outlet point of the lubricating oil electromagnetic control valve through two water supply branched pipelines, the communicating points are then connected with an oil water mixer, an oil water mixture is sprayed on an upper working roll and a lower working roll by the oil water mixer through a metallic hose and a spraying header to lubricate the upper working roll and the lower working roll, a cooling water header is used for cooling the upper working roll and the lower working roll, and a water cutting plate can cut the oil water mixture, thereby avoiding the oil water mixture from spraying on rolled pieces and ensuring the quality of the rolled pieces. Because of adding the water filter, the metallic hose, and the like capable of being directly connected to the feculent circulating water, the lubricating device saves the cost, enhances the antivibration capability of technological lubricating equipment and has good installation and maintenance performance, good lubricating effect and popularization value.