The invention discloses a well leakage control valve. The well leakage control valve comprises an outer cylinder, a middle cylinder assembly, a ball seat assembly, a spring assembly and a middle cylinder core shaft; the middle cylinder assembly is connected to the inner side of the outer cylinder through a guide pin, the ball seat assembly is mounted to the upper part of the inner side of the middle cylinder assembly through interference fit, the middle cylinder core shaft is connected to the lower part of the middle cylinder assembly through threads, and the spring assembly is located in a ring cavity between the outer cylinder and the middle cylinder core shaft. According to the invention, common site drill-pipe tools can be used, so that the well leakage control valve enters the operation position in a well, when well leakage occurs in the well drilling process, a switch ball and an isolation ball which are different in size are thrown to open or close a bypass channel. Therefore, the plugging function is realized to effectively protect precision tools of a drill assembly bottom screw drill tool, rotary steering, MWD and the like; in addition, the tool can realize multiple plugging operations in one drilling. The well leakage control valve disclosed by the invention is simple in structure, high in stability, convenient to operate and low in manufacturing cost.