A kind of antipollution protection mechanism of underwater sensor is including a main body, a sensor, a rubber washer and a sleeve. The main body system is in cylindrical body. The sensor system is in the cylindrical body of circular surfaces central concave, and is arranged in the what main body. The rubber washer system is annular in shape, and is arranged on the what sensor. The sleeve system is in hollow cylinder lid, and plural aperture is arranged in center, which is arranged on the what rubber washer, and coats the sensor. Another embodiment system of this creation is by one around the fixed what sensor probe distal end of ring coil patch； to protect sensor to exempt from the dirty attachment of what； this creation system protects sensor by sleeve or around ring coil, effectively to delay sensor to be adhered to by soils such as algae, microorganism, worm's ovum and sticky dirty things.一種水下感測器的防汙染的保護機構，係包括一主體、一感測器、一橡膠墊圈及一套筒。該主體係呈圓柱體。該感測器係呈圓表面中心凹陷的圓柱體，並設置於該主體上。該橡膠墊圈係呈圓環狀，並設置於該感測器上。該套筒係呈中空的圓柱蓋體，中心設置複數開孔，該套筒係套設於該橡膠墊圈上，並包覆該感測器。本創作另一實施例係將一繞環線圈貼片固定於感測器探頭前端，用以防護感測器免於髒污附著，本創作係藉由套筒或繞環線圈保護感測器，以有效延緩感測器被藻類、微生物、蟲卵以及黏稠穢物等髒汙物附著。
