The invention provides an intelligent multifunctional lamp base of a cross-shaped structure, belongs to the technical field of illumination, and particularly relates to the multifunctional lamp base. The multifunctional lamp base comprises an intelligent controller, a conversion adapter, a lamp connector and a rail. The intelligent controller is connected with the conversion adapter through a signal line and can control lamplight atmosphere selection, lamplight color conversion and lamplight brightness of the multifunctional lamp base. The conversion adapter is of the structure that the conversion adapter makes contact with the rail, and by means of the structure, the multifunctional lamp base can make turns and move at right-corner positions on the rail. The lamp connector is installed at the lower end of the conversion adapter, is of a detachable structure and can be used for installing multiple different lamps. The rail is an electrified system device installed on a ceiling, is of a detachable structure and can provide the guide rail for the conversion adapter, and electricity is supplied to the lamps through contact heads. The intelligent multifunctional lamp base of the cross-shaped structure is convenient to install and easy and convenient to control, the different lamps can be conveniently replaced due to the detachable structures, and functions are diversified.