The invention discloses multifunctional electric power construction machinery which structurally comprises a cable inlet roller, a cable inlet frame, a main conveyor, a transmission motor, a mountingplate, an adjusting device, a fixed bottom plate, a cable outlet frame, a cable outlet roller, an auxiliary conveyor and a conveying belt. The construction machinery has the advantages that the construction machinery is provided with the adjusting device, the adjusting device drives a first bevel gear and a second bevel gear through control of a handle in a main transmission mechanism, so that a second transmission mechanism releases a first transmission rope in a third transmission mechanism, a power plug in a driving device and a motor socket can be powered on to drive a driving roller and adriving clamping sleeve to rotate, a lifting mechanism drives a linkage shaft clamping sleeve to rise, the linkage shaft clamping sleeve and the driving clamping sleeve are driven in a sleeving manner, a winding function of a winding roller is achieved, a base of the auxiliary conveyor can move in a driving manner, cables with different thicknesses are conveniently conveyed, use functions are widened, adjusting convenience is greatly optimized, and use of workers is facilitated.