The invention discloses a multi-parameter water quality analyzer. The multi-parameter water quality analyzer comprises a hand-held controller and at least one intelligent sensor, wherein the hand-held controller comprises a battery, a battery management module, a display module, a first DC/DC (Direct Current) module, a second DC/DC module, a first central processing unit, a keyboard and a first analogue-to-digital interface; each intelligent sensor comprises a second central processing unit, a third DC/DC module, a second analogue-to-digital interface, a reference voltage source, a signal acquisition module and a sensor. The multi-parameter water quality analyzer is provided with a plurality of sensors, thus being capable of detecting parameters such as PH (potential of hydrogen), OPR (Oxidative Phosphorylation), electrical conductivity and dissolved oxygen content in water, comprehensively detecting the water quality and accurately judging the water quality; meanwhile, the detection part is separated from the observation part so that a user can observe the detected water quality parameters by use of the hand-held controller in the finite range without being restricted to a water quality detection site; the multi-parameter water quality analyzer is provided with the rechargeable battery, thus being capable of working normally without external power source; therefore, the analyzer can be applied to remote water quality detection sites conveniently.