Isolation controllable water entry detection sensor

The utility model provides an isolation controllable water entry detection sensor, which is used for water entry detection and identification and comprises a secondary power supply circuit, a CPU (central processing unit) circuit, an isolation control circuit, a detection circuit, a feedback isolation circuit and a sensor probe. The secondary power supply circuit mainly provides required power supplies for the CPU circuit, the isolation control circuit, the detection circuit and the feedback isolation circuit; the CPU circuit controls the sensor probe to be connected through the isolation expansion circuit after receiving a detection instruction, then the detection circuit judges a water inlet and outlet detection result according to the collected voltage at the two ends of the sensor probe and a set voltage threshold value, the feedback isolation circuit feeds back the detection result to the CPU circuit, and the CPU circuit transmits the detection result outwards through the communication interface. Accordi