A portable multi-parameter water quality detector comprises a touch screen, a PLC (programmable logic controller), a direct-current power supply, a cable, a wire wrapping disk, a multi-parameter waterquality detector. The multi-parameter water quality detector comprises a shell, mulltiple water quality sensors, a micro power supply, a water-proof cover, the shell comprises an upper shell body, amiddle shell body and the lower shell body, a front end of the cable is connected to a top end of the upper shell body; the multiple water quality sensors and the micro power supply are arranged in the water-proof cover; a bottom end of the lower shell body is provided with an axial through hole for enabling aqueous medium to flow through, the outer side wall of the lower surface is provided multiple opening grooves for enabling the aqueous medium to flow through, probes of the multiple water quality detector stretches our from the water-proof cover and stretches into a cavity of the lower shell body to contact the aqueous medium. The multi-parameter water quality detector provided by the invention can effectively and quickly perform multi-parameter detection on the aqueous medium in a well under the condition without electric supply in the open air, and is convenient to use, simple in operation, practical, accurate in detection results and easy to use in the field, the demand problemof multi-parameter detection on underground water quality is solved.