The utility model discloses a fertilization monitoring device, which is characterized by comprising a casing (1) and sensor assemblies arranged at monitoring sites. A control circuit is arranged in the casing (1), the sensor assemblies are respectively electrically connected with the control circuit which comprises a power module (21), a switch module (25) and a drive module (23), the power module (21) is controlled by the switch module (25), the drive module (23) is powered by the power module (21), and the drive module (23) is used for receiving signals of the sensor assemblies. The fertilization monitoring device is capable of timely monitoring fertilizer insufficiency or blockage so as to improve operating efficiency and guarantee fertilizing quality, and convenient to operate.