Anti-theft oil well sampling device

The utility model relates to a device for production in an oil field, in particular to an anti-theft oil well sampling device. The device is provided with a sleeve of which one end is closed, wherein the sleeve is provided with an internal thread; a hollow sampling tub is arranged in the sleeve through the thread; the closed end of the sleeve tilts upwards and is arranged in an oil pipeline; an oil extraction hole is formed on a side wall of the closed end of the sleeve and is arranged in the oil pipeline; an annular baffle is arranged outside the sleeve; a stop pin is arranged on the inner wall of a cylindrical protective box, and a lockset is arranged on one side opposite to the stop pin; a lock tongue of the lockset stretches into the protective box; and the protective box is locked on the sleeve through the stop pin and the lockset. The anti-theft oil well sampling device is simple in structure and convenient to operate, the problem of dead oil is avoided, the test result is reliable, and the crude oil ca