The utility model relates to a downhole switch without well killing. In order to overcome the deficiencies existing in the prior downhole switch without well killing that the oil well pump barrel overload is caused easily, the construction work load is increased, and the formation contaminant and damage are caused, an upper connector (1), a pup joint (7), a casing body (11) and a valve body (25) of the utility model are fixed and connected with each other from the upper part to the lower part in sequence; an inner piston (6) is fixed and connected with an outer piston (9); springs (8) are respectively arranged on the outer circumference of the inner piston (6), and between the inner step of the outer piston (9) and the valve body (25); a track dowel (10) is installed at the lower part of the inner piston (6); a track sleeve (13) is installed on an axle (12); a radial liquid inlet hole (21) is arranged on the casing body (11), a radial liquid inlet hole (20) is arranged on the outer piston (9); a ball (4) is arranged on a through hole (23), and a flowing hole (2) is arranged on a ball cover (3). The utility model has the advantages that the structure is simple, the operation is convenient, and the on-off reversing of the switch is controlled through applying hydraulic pressure on the ground.