The utility model provides an interim protection device of sensor, it includes: horizontal base, horizontal base have seted up through hole of base, and through hole of base runs through horizontal base along horizontal base's thickness direction, and horizontal base's material is magnetic material, the baffle, the baffle is perpendicular and connects in horizontal base's upper surface, begins tohave the waterproof air vent of sand control in the baffle, the one end and the through hole of base intercommunication of the waterproof air vent of sand control, the other end of the waterproof airvent of sand control with offer in the baffle blow vent intercommunication of a side of baffle, the baffle blow vent is close to the top of baffle, the waterproof air vent of sand control is N shape structure, and offers the earial drainage way of the outside that feeds through the baffle on the waterproof air vent of sand control. Utilize the utility model discloses an interim protection device of sensor's overall structure can prevent effectively that the saline quality of water of carbonic acid, silt, construction rubbish etc. From stopping up the collection of the test hole of sensor, assurance test initial value under natural condition.