Grain heavy metal rapid detector and detection method thereof

The invention discloses a grain heavy metal rapid detector which comprises a supporting module, a detection module, a sample pool, a base solution pool, a cleaning module, a signal acquisition module, a control module, a display screen and an alarm, the detection module comprises a detection probe and a displacement structure, the detection probe is fixedly connected with the displacement structure, and the supporting module comprises a linear motion structure and a shell. The linear motion structure is located in the shell, the detection module, the cleaning module, the sample pool and the base solution pool are all located above the shell, the detection module is fixedly connected with the linear motion structure, the sample pool and the base solution pool are located below the detection probe, and the signal acquisition module and the control module are both installed in the shell. The control module is in signal connection with the displacement structure, the signal acquisition module, the electromagnetic