Water cutting assisting device of storage tank

The invention provides a water cutting assisting device of a storage tank. The water cutting assisting device comprises the storage tank, an automatic water cutting device and an observation box, wherein the storage tank is communicated with the automatic water cutting device; the automatic water cutting device is communicated with the observation box; the observation box comprises an observation box body, a water inlet pipe, a water outlet pipe and a water discharging pipe; the water inlet pipe is arranged at the upper part of the observation box body and is communicated with the automatic water cutting device; the water outlet pipe is arranged at the lower part of the observation box body; a baffle plate is arranged in the observation box body; the baffle plate is arranged between the water inlet pipe and the water outlet pipe; the water discharging pipe is arranged at the bottom of the observation box body. When water cutting is carried out in the storage tank, whether discharged water contains oil or not