The invention discloses a radial sliding bearing with self-adaptive oil retaining devices. The radial sliding bearing with the adaptive oil retaining devices comprises a lower half of the radial sliding bearing formed by a lower bearing seat and a lower bearing, and an upper half of the radial sliding bearing formed by an upper bearing seat and an upper bearing; two oil inlets are formed in the lower half and the upper half; the two self-adaptive oil retaining devices are separately arranged the upstream sides of the two oil inlets; each self-adaptive oil retaining device consists of an oil retaining block, a spring and an adjusting screw; the extending ends of the oil retaining blocks are provided with small inclined plane structures; wedge-shaped convergence gaps are formed between the oil retaining blocks and a shaft neck along the rotating direction of the shaft neck; one ends of the springs are pressed on the extending ends of the oil retaining blocks; and the other ends of the springs are connected with the adjusting screws in a fitting mode. By utilizing the dynamic balance formed by the oil film force of a hydrodynamic pressure effect and the elastic force of the springs, the distance between the oil retaining blocks and the shaft neck is adjusted in real time so that the distance between the oil retaining blocks and the shaft neck can be self-adaptive and kept to be arelatively stable value; and according to the radial sliding bearing, the adaptability of the oil retaining devices is good, the oil retaining effect is stable, and the temperature of lubricating oilin the radial sliding bearing is obviously reduced.