The invention discloses an intelligent water quality detection device, which comprises a shell, wherein an electric system module providing electric power needed in a system, a control system module, a display module and an operating button unit are arranged in the shell; and a waterway connection terminal connected with a waterway pipeline needing detection is arranged outside the shell, a water quality detection module is arranged in the waterway connection terminal, detected water quality parameter signals flowing by the waterway connection terminal are transmitted to the control system module by the water quality detection module, after internal comparison and computation, the comparison result parameter values are output by the control system module to be displayed in a display module, and the comparison parameter values of the control system module can be set by the operating button unit. The device is convenient to install, is light and small, does not need external electric power, can be used for detecting current water quality condition in real time and displaying the condition intuitively, and is suitable for being arranged at a terminal drinking water source.