The invention discloses a new important intermediate of lycopene, 3,7,11-trimethyl-1,3,6,10-tetraene dodecyl diethyl phosphate. The synthetic process of the traditional lycopene intermediate 2,4,6,10-4-pentadienyl phosphonate has a certain difficulty. The invention provides a new intermediate, the synthetic process of which comprises the steps of preparing 2,6,10-trimethyl-3,5,9-undecane triene-1-aldehyde from false ionone; preparing 2,6,10-trimethyl-2,5,9-undecane triene-1-aldehyde from the 2,6,10-trimethyl-3,5,9-undecane triene-1-aldehyde; carrying out condensation reaction on the 2,6,10-trimethyl-2,5,9-undecane triene-1-aldehyde and methylene biphosphonic acid tetraethyl ester to obtain the target product. The false ionone is used as the raw material and only four reaction steps are needed for preparing the new intermediate, the reaction is easy to control, and the invention has great industrial values.