The invention discloses a probe assembly for monitoring seawater quality, which belongs to the technical field of environment monitoring. The probe assembly comprises an outer shell, a protection shell and a protection sleeve, wherein the bottom of the outer protection shell is provided with a storage box, the bottom of the storage box is provided with an openable and closable bottom cover, poresare uniformly formed in the bottom cover, the protection sleeve is arranged outside the protection shell in a sleeving manner, and the protection sleeve consists of a low-density layer and a high-density layer sleeving the low-density layer. By adopting the probe assembly for monitoring the seawater quality, the material scattering the smell disliked by a breeding object is placed in the storage box on the bottom of the protection shell, after the material is independently dissolved, the material permeates into the protection sleeve, and the protection sleeve sleeves the outer side of the protection shell, so that in a monitoring process, the breeding object does not approach the probe assembly, the data deviation caused by the swinging of the breeding object around the probe assembly in the monitoring process can be avoided, and the damage problem of the probe caused by the collision of the breeding object can be avoided.