The utility model discloses an oil sampling device for oil well, it relates to oil gas exploitation technical field, and oil sampling device for oil well includes: the staving, the cavity has in the staving, seted up on the staving with the first opening and the second opening of cavity intercommunication, the setting is in first lid on the first opening, first lid includes the base and sets up top cap on the base, the top cap can be right first lid carries out the switching, the second lid of setting on the second opening, the setting is in the base of first lid with screen cloth between the staving sets up the screen cloth with filter unit excessively between the staving. The dehydration to sample liquid has directly been realized through this oil sampling device for oil well for what whole sample process became is simple swift, can realize airtight sample simultaneously, avoids the problem that polluted environment or crude oil splashes.