A marinating device includes a supporting base having a blocking sidewall, a food marinating container having a guiding rib and a container sidewall physically contacted with the blocking sidewall to block a sideward movement of said food marinating container at a first sideward direction, and an electric driving arrangement. The electric driving arrangement includes a driving unit and a plurality of driving rotors adapted to be driven by the driving unit to rotate. At least two corresponding driving rotors are frictionally and alignedly engaged with the guiding rib to block the sideward movement of the food marinating container at an opposed second sideward direction such that when the food marinating container is driven to rotate via the driving rotors, the food marinating container is securely retained on the supporting base.