To see a cornucopia in your dream represents abundance, plentitude, fertility and prosperity.
The dream also highlights the union of the feminine and masculine aspects.
SYMBOLISM
In mythology, it was the goat Amalthea who fed the infant Jupiter with milk. Given that the general symbolism of the horn is strength, and that the goat has maternal implications, and in addition that the shape of the horn (phallic outside and hollow inside) endows it with a complex symbolism (including that of the lingam, or symbol of generation), it is easy to understand its allegorical use as the horn of abundance. Piobb points out also that the cornucopia is an expression of prosperity deriving from its association with the zodiacal sign of Capricorn.