The invention discloses a rolling oil fueling and saving device for cold-rolled plate strip steel, comprising a rolling oil container, a fixed-quantity small container, an emulsion container and a computer control system, wherein a discharging pipe of the rolling oil container is connected with the fixed-quantity small container or the emulsion container by a rolling oil pump, a flow sensor and an electromagnetic valve; a discharging pipe of the fixed-quantity small container is connected with the emulsion container by the electromagnetic valve, a twisting and grinding machine and an online grain tester; the emulsion container is also connected with a water supply pipe by the electromagnetic valve; a mixer is arranged at the emulsion container; a discharging pipe of the emulsion containeris connected with an air pump; the rolling oil pump, the flow sensor, the electromagnetic valve, the twisting and grinding machine, the online grain tester, the mixer and the air pump are connected with the computer control system and can be controlled by the computer control system. The rolling oil fueling and saving device can realize the aim of saving oil and can reduce oil consumption.