Urea box filling port structure and urea box

The invention relates to the field of automobile parts, in particular to a urea box filling port structure and a urea box. The urea box filling port structure comprises a sleeve, a filter screen is arranged in the sleeve in a sleeved mode, the bottom of the sleeve is provided with a main liquid leakage port and a floater assembly switching opening and closing of the main liquid leakage port, and the bottom wall of the sleeve is further provided with a liquid leakage hole used for preventing liquid accumulation. When a urea solution is injected into the urea box, if the liquid level height of the urea solution reaches the preset maximum height, the floater assembly below the sleeve floats under buoyancy and blocks the main liquid leakage opening. The liquid level in the sleeve can quickly rise to remind a user that the liquid level height of the urea solution reaches the maximum height, the urea solution accumulated in the sleeve is discharged into the urea box, and the problem that the sleeve is damaged due t