In order to solve problems in the prior art, the invention provides a sliding table lifting system used for a Chinese wolfberry picking mechanism. The sliding table lifting system comprises a sliding table I and a lifting table, wherein the lifting table is connected with a rack through the sliding table I; the sliding table I comprises a sliding table main body, a slide block I, a step motor, a drive gear and a driven rack; the sliding table main body is fixed on the rack; the inner two sides of the sliding table main body are embedded with driven racks; the slide block I is arranged on the sliding table main body; and the sliding table main body is connected with the lifting table through the slide block I. The step motor and the drive gear are fixedly arranged on the slide block I; the drive gear is fixed on a shaft of the step motor; and the drive gear is staggered and engaged with the driven racks. According to the sliding table lifting system, transverse force stress of the sliding table is increased, so that the sliding table lifting system is guaranteed to not generate wiggling due to relatively great load, and stable lifting power is provided.