The utility model discloses an ultraviolet ray disinfection device that is used for sensor that has of drinking water treatment, wherein, the upper end in stainless steel shell (4) is fixed by loose joint (1) in quartz protecting tube (3), UVC fluorescent tube (2) vertical being provided the inside of quartz protecting tube (3), be provided respectively with delivery port (8) water inlet (5) the both sides of stainless steel shell (4), measure and controller (10) tracking detection the real -time power of UVC fluorescent tube (2). The utility model discloses can ensure that rivers obtain the radiation of ultraviolet ray maximum homogeneous, the aseptic rate can reach 99.99% that surfaces, it is convenient to install and use, long service life, and application scope is extensive, can be applied to water treatment disinfection technology, can be satisfied, quick travel style water treatment facilities need be realized like war water pollution, desert island, earthquake relief, rescue in -process and the demand of drinking water is prepared.