Provided is portable folding steel-plastic three-wheeled pedal bike skillful in use. The portable folding steel-plastic three-wheeled pedal bike skillful in use comprises a front frame, a bike body, a folding connecting rod, a front fork, a V-shaped folding handlebar, a front wheel, a left rear wheel, a right rear wheel and a driving mechanism. The front frame is provided with a first connecting lug, a second connecting lug and a front head tube; the bike body comprises a frame, bearing inserts, a first bearing, a second bearing, a third bearing and a panel, wherein the frame is provided with a beam tube, a fixed frame, a locating shaft, a first circular tube, a second circular tube, a rear fork and a reinforcing sheet, the panel is connected to the rear fork, the bearing inserts, the first bearing and the second bearing are connected with the frame, the first circular tube is connected with the second connecting lug, the folding connecting rod is connected with the first connecting lug and the second circular tube, the front fork is connected with the front head tube, the V-shaped folding handlebar and the front wheel, a crankshaft gear is installed on the first bearing, foot levers are connected to the locating shaft in a sleeved mode, and are connected with the connecting lugs and pedals, swing sheets are connected with the connecting lugs and the crankshaft gear, a counter shaft is connected with a chain wheel and a later-level gear, a flywheel is installed on a rear shaft, the left rear wheel and the right rear wheel are installed at the two ends of the rear shaft respectively, and a chain surrounds the chain wheel and the flywheel in a connected mode.