The invention provides a liquid rocket engine test pressure sensor cleaning device. The liquid rocket engine test pressure sensor cleaning device is composed of an ultrasonic generator, ultrasonic transducers, a cleaning tank, cleaning liquid, a sensor cleaning basket and a shell, and the sensor cleaning basket comprises a cleaning basket cover, a sealing ring, a cleaning basket main body and a cleaning basket base; the cleaning basket cover covers the cleaning basket main body, and the sealing ring is located at the joint of the cleaning basket cover and the cleaning basket main body and is used for preventing the cleaning liquid from flowing into the sensor cleaning basket from a gap between the cleaning basket cover and the cleaning basket main body; the cleaning basket main body is placed on the cleaning basket base and can be rotated by a certain angle on the cleaning basket base; and the cleaning basket cover is provided with an M14x1.5 inner thread and matched with a mechanical interface of a pressure sensor, and sealing is performed through a sealing spring gasket.