The utility model discloses an oil well indicator card sensor protecting device can effectively solve the oil well indicator card sensor damage's that the beam -pumping unit polished rod slowly caused down problem, improves the life of indicator card sensor, practices thrift manufacturing cost. This device is equipped with horizontal telescopic machanism including upper cover and lower cover in, be equipped with vertical spring between upper cover and the lower cover, and upper cover and lower cover all are equipped with the polished rod and pass the hole, below installing this device on the polished rod of polished rod eye top, lie in the load checkpost. Avoided the sensor to receive the damage of strikeing and causing, this protection device can avoid the damage of sensor when the oil well breaks down effectively, has prolonged the life of sensor, has practiced thrift manufacturing cost, has improved the production time efficiency of oil well, has reduced workman's intensity of labour, has apparent economic benefits.