The utility model discloses a straight pushing -type tee bend auto -change over device of manual control, including A fluid collecting pipe, B fluid collecting pipe, the buffering manifold, straight pushing -type diverter valve, straight pushing -type diverter valve valve body lateral wall both ends are provided with goes up liquid stream port and 2 lower liquid stream ports with communicating 2 of inner chamber, a fluid collecting pipe, B fluid collecting pipe one end is connected respectively in the last liquid stream port at valve body both ends, the buffering manifold is three -way pipe, two ports are connected with the lower liquid stream port at valve body both ends respectively, two tops in the valve body are provided with the sealed pad of " V " shape respectively, control liquid stream -switching's the case body is a column piston body, both ends have the conical body, form sealedly with the sealed conical seat of the pad cooperation of " V " shape, be equipped with on the case body and the valve body and take the movable valve element body to remove the manual control assembly who realizes liquid stream -switching. The utility model discloses a can does the manual mode cut off with the aid of the movement change of pin, be 2 3 accomplish in second and switch, realized fast switch over between the different fluids of the large -scale acid fracturing continuous liquid supply of oil gas well.