It includes portable computer, sensors, amplifier, interface circuit and rechargeable power supply, and is characterized by that the quartz crystal is used as the sensing element of pressure sensor, two sensors which are different in output polarity are symmetrically clipped on the oil pipe wall to be tested by means of clamping devices; and its rotating sensor adopts the single-head reflection mode. An oriented reflection is used and the reflection signal is received by means of photoelectric sensor. The output signal of the sensor is passed through the interface circuit and fed into the computer so as to output the pressure wave form, which is compared with the standard wave spectrum for fault to analyze the falt and disadvantage in oil injection system.