The invention discloses an intelligent control system and control method for a multifunctional rainwater storage pond. The control system comprises a power distribution control box, hinges, a box door, a handle, hasp locks, air outlet elbows, an outer frame, a ceiling, a thermal insulation layer, a protective layer, a left supporting strip, a right supporting strip, a bearing, a square hole sleeve, a first spring, a square rods, bent rods, round holes, a water level sensor, a PH sensor, a salinity sensor, a protection structure, rubber gaskets, arc-shaped steel sheets, a second spring, a rectangular mesh enclosure, a double-shaft motor, a mounting frame, fan blades, a round block, rectangular blades, a first drying agent layer, a hollow rectangular plate, short pipes, a vertical plate, a single-chip microcomputer, an air switch, and a leakage protector. According to the invention, multiple sensors are used for sensing to realize sensing; intelligent controlling is performed by cooperating with the power distribution control box; sensors are installed by rotating the mounting structure, so that sensors are convenient to take out from or install in the pond.