The invention provides a mounting protection device for a vibration sensor. The device comprises a base and a protective cover. The base can be embedded in workshop floor. A threaded hole for connecting the vibration sensor is arranged in the middle of the top surface of the base. A containing groove is formed in the circumferential direction of the top surface of the base. The protective cover can move up and down, and is arranged in the containing groove. A through hole for the vibration sensor to pass through is arranged on the top surface of the protective cover. The protective cover is enclosed with the base by moving up to form a containing space for containing the vibration sensor. The lower part of a side wall of the protective cover is limited to the upper part of the containing groove by a limiting piece in a state that the protective cover and the base are enclosed to form the containing space. According to the mounting protection device for the vibration sensor, damage to avibration sensor body caused by collisions of the vibration sensor and other people or objects can be prevented; and the mounting protection device of the vibration sensor can be integrated with theenvironment when not needed, so that normal production activity of the power plant is not affected.