A foldable child tricycle with a front tube fitting, a saddle and a beam in linkage comprises the front tube fitting, the beam, the saddle, a connecting rod, a steering shaft, a handlebar, two front wheels and a rear wheel. The front tube fitting is formed by welding a front head tube, a groove-shaped seat and a U-shaped foldable seat. The beam is formed by connecting a beam column, small round tubes, a groove-shaped seat, a rear fork, a cylinder with threaded holes and bolts with handles. The saddle is connected with the groove-shaped seat of the front tube fitting and the connecting rod, the connecting rod is connected with the groove-shaped seat of the beam, and the steering shaft is formed by connecting a vertical shaft tube, a transverse shaft tube and wheel axles. The vertical shaft tube is connected with the front head tube, the wheel axles extend out of the two ends of the transverse shaft tube, the two ends of the wheel axles are sleeved with the two front wheels, the lower end of the handlebar is connected to the upper end of the vertical shaft tube through a handlebar hoop in a hooped mode, and the rear wheel is connected with mutual opposite-penetrating holes of the rear fork through opposite-locking bolts.