The invention provides an aquaculture pond inspection sign-in and water quality detection device and system and a realization method. The device and system comprises a microcontroller, a Bluetooth module, an electronic tag, a narrowband Internet of things module, a temperature sensor, a dissolved oxygen sensor, a pH sensor, a centralized display screen, a mobile phone and APP and a cloud platform. According to the system, through combination of periodic online detection for water quality and periodic pond inspection of aquaculture workers, the occurrence probability of an aquaculture event is reduced; worker confirmation is carried out by holding the mobile phone and APP to inspection points; the condition that the pond inspection workers slack off is effectively avoided; and dynamic pond inspection paths, pond inspection time and related monitoring information are automatically recorded, thereby facilitating trace confirmation after the event. According to the device, the system and the method, the pond inspection efficiency can be improved; the supervision force of a boss for the workers can be reduced; the boss does not need to supervise the workers all the time; the technical realization is convenient; and the market prospect is wide.