The invention discloses an ultrasonic lobster cleaning machine. The machine comprises a lifting and conveying mechanism, a first-level cleaning mechanism and a second-level cleaning mechanism; the lifting and conveying mechanism comprises a second motor, a feeding crawler belt and a buffer bin, and the second motor is in driving connection with the feeding crawler belt; the first-level cleaning mechanism comprises a hexagonal strip sieve and a first water pump, the hexagonal strip sieve is provided with an inner strip sieve nozzle and an outer strip sieve nozzle, and the inner strip sieve nozzle and the outer strip sieve nozzle are connected with a first water pump; the second-level cleaning mechanism comprises a first motor, a conveying crawler belt, a cleaning tank, an ozone machine, an ultrasonic generator and an air pump, the first motor is in driving connection with the conveying crawler belt, the ozone machine and the ultrasonic generator are both located below the cleaning tank, and an ozone output pipe of the ozone machine is connected to a gas nozzle. The ultrasonic lobster cleaning machine comprises the two levels of cleaning mechanisms, the thorough cleaning degree is high, impurities and sticking substances on the surfaces of lobsters can be cleaned, hidden positions of the lobsters such as the gill positions can be cleaned and sterilized, and reliability and environmental protection are achieved.