In order to quickly detect the oil quantity sensor and improve the detection efficiency, a scheme about handheld oil quantity sensor of reed switch based on DSP is designed. The device adopts two wire resistance measuring method to measure the position resistance of the oil quantity sensor. By powering by dry batteries, taking the TMS320F28335 of TI as the core controller, collecting the sampling of the voltage of the sensor through the high speed ADC module in the chip of the core controller, and analyzing the sampling data, the test results are finally displayed through the 12864LCD screen. After many tests, the device can quickly and accurately detect the fault of the reed switch oil quantity sensor and can be made of the handheld. The device is stable, easy to use and easy to carry.