The invention discloses a sliding valve type zero leakage reversing valve. The reversing valve solves the problem that leakage is prone to occurrence in an existing two-way cartridge valve large-flowsystem. The reversing valve comprises a valve sleeve and a valve element, a first working port, a second working port and an accommodating cavity are formed in the valve sleeve, the valve element is internally sleeved with the accommodating cavity of the valve sleeve and is in sliding fit with the valve sleeve, the valve element is provided with a first position which can be opened to enable the first working port and the second working port to communicate with each other and a second position which is closed to enable the the first working port and the second working port to be isolated fromeach other, the valve element comprises a first guiding part, a second guiding part and a sealing part, the first guiding part and the second guiding part are correspondingly attached to the inner wall of the parts, at the positions corresponding to the first guiding part and the second guiding part, of the valve sleeve, the sealing part is conical, and the sealing part cooperates with the valve sleeve to realize sealing when the valve element is in the second position. The reversing valve further has the advantages of being simple in structure, convenient to assemble, reliable in action, longin service life and the like.