An ultrasonic rock salt continuous cleaning method and an ultrasonic rock salt continuous cleaning device are provided. The ultrasonic rock salt continuous cleaning method comprises, in a loading and pre-examining stage, loading and pre-examining a solid substance, where first sample information of the solid substance is collected; in a pre-cleaning stage, pre-cleaning the solid substance, wherein a cleaning fluid is applied; in an ultrasonic cleaning stage, ultrasonic cleaning the solid substance; in a drying stage, drying the solid substance, where the solid substance is dried in two stages, in a first stage, the solid substance is dried using a high-pressure air, and in a second stage, the solid substance is dried using hot air; and in an unloading and examining stage, unloading and examining the rock salts, where second sample information of the solid substance is collected.