The invention discloses a replaceable abrasion sensor which comprises a sensor body, a cable connected with the sensor body, and a cable storage device connected with the abrasion sensor body, wherein a wire outlet hole is formed in the upper surface of the cable storage device, and a wire inlet hole is formed in the lower surface of the cable storage device; the cable is arranged in the cable storage device. Meanwhile, the invention also provides an assembling method and a using method of the abrasion sensor and the cable storage device thereof. The replaceable abrasion sensor is applied to the field of safety monitoring and detection of repair replacement of hydraulic prototype observation sensors and water resources and hydropower engineering, the problem that the length of the cable is insufficient in the process of repairing the replaceable abrasion sensor is solved, and convenience is brought to repeated maintenance of the abrasion sensor.