Compound pressure-bearing equipment internal flaw detection system capable of combining flux leakage coarse detection with ultrasonic accurate measurement

The invention discloses a compound pressure-bearing equipment internal flaw detection system capable of combining flux leakage coarse detection with ultrasonic accurate measurement. The system consists of a Hall element array, a U-shaped magnetic core, an exciting coil, a signal processor, a power supply module, a single chip microcomputer, a power amplifier stimulation end impedance matching device, an emission probe, a receiving probe and an upper computer, wherein the single chip microcomputer outputs a low-frequency alternating signal to the exciting coil; the U-shaped magnetic core is magnetized to enable the U-shaped magnetic core to form a local flux leakage environment with a construction member to be detected, a detected magnetic conduction component forms a leakage magnetic fieldon a defect position and is sensed by the Hall element array positioned in an area; after the detected magnetic conduction component is subjected to signal processing, the detected magnetic conduction component is sent into