The utility model relates to an oil guide device of a non-standard oil drain valve of an oil filling equipment, which is used for guiding an oil sample into a sampling bottle or an injector when the non-standard oil drain valve of the oil filling equipment in a power system extracts the oil sample. The structure of the oil guide device is that a fixed part connected with an oil drain valve hole is arranged above an oil guide box; an oil discharging hole is formed in the oil guide box; the lower part of the oil guide box is connected with an oil nozzle. According to the oil guide device, the original sampling valve structure of oil abandoning equipment is not changed, the escape of water and gas which are dissolved in oil of the oil sample are alleviated when a non-standard sampling valve of the oil filling equipment samples the oil, so that the site sampling of the oil filling equipment closely meets the GB7597 requirement, and the test precision is improved; the oil guide device can slow down the flowing speed of oil flow through the oil guide box, so that frequent exchange between the oil sample and air is avoided; the oil guide device is conveniently connected with a sampling three-way device recommended in the GB7597 requirement, and therefore full-sealing sampling is realized.