The utility model provides an underground anti-winding eccentric locator for a testing cable. An upper joint and a lower joint connected with an oil tube are respectively arranged on and under the locator, wherein an anti-winding location tube is arranged on the middle part, an anti-winding blade is connected on the anti-winding location tube, the lower joint is connected with fixed pins, the lower end of the anti-winding location tube is provided with a plurality of grooves matched with the fixed pins, and the upper end of the anti-winding location tube is further connected with a pressing cap connected with a baffle ring. The baffle ring is connected on the pressing cap, and the anti-winding blade is spirally connected on the outer surface of the anti-winding location tube. The pressing cap acts together with the fixed pins so as to prevent the anti-winding location tube from moving and play a location role; and the baffle ring can ensure that the pressing cap drops in the operation process.