At present, an oil level sensor has the defects of poor corrosion resistance, poor size universality, single function and the like, and aiming to solve the problem, the invention provides a telescopicoil level sensor device. The telescopic oil level sensor device comprises a signal cable, a cable interface, an electric appliance box, a mounting flange, a sealing ring, an oil suction pipe connector, an exhaust pipe connector, an oil return pipe connector, an exhaust hole, an oil return pipe, an oil return port, a plug cover, an induction pipe, an oil floater, an oil suction pipe, a filter screen cover, a filter screen and a spring, so that the functions of oil absorption, oil return and oil quantity measurement are integrated; the filter screen cover, the filter screen, the spring and theplug cover form an elastic movable device to realize direct contact with the bottom of the oil tank, so that the sensor device is telescopic and adjustable in length and is suitable for oil boxes withdifferent heights; the oil liquid at the bottom of the oil tank is fully sucked and utilized, the oil liquid at the bottom of the oil tank is circulated and replaced, and fuel waste is avoided, the formation of a bottom oil liquid deposit layer is prevented; and the characteristics of light weight, universality and multiple functions are realized, and a very wide application prospect is achieved.