Oil-drainable tube type oil-well pump

The utility model discloses an oil-drainable tube type oil-well pump, which is suitable for an oil exploitation well. The pump consists of a pump cylinder assembly (1), a plunger piston assembly (3) and a standing valve assembly (14), wherein two clamping jaws (8) are arranged at the lower end of a lower joint (7) of a plunger piston; a groove (9) is arranged in the upper end of a standing valve cover (10); the clamping jaws (8) are matched with the groove (9); two oil outlets are arranged in the groove (9), and a valve rod (12) and a spring (11) are mounted in one oil outlet; an ejector rod (5) is mounted in a center position of the upper end of the standing valve cover (10); when oil needs to be drained, the two clamping jaws (8) enter the groove (9) in the standing valve cover (10), and push the compression spring (11) of the valve rod (12) to move downwards, a standing valve ball (11) is poked away by the valve rod (12), a floating valve ball (14) is ejected away by the ejector rod (5), and crude oil in a