The central pin type forced steering radial mechanism has a radial truck which has forced steering, self steering and flexible steering performance. A novel radial adjustment mechanism is adopted to reduce the longitudinal positioning rigidity of a wheel pair opposite frame and to enable wheel pairs to approach in the radius direction as much as possible when the truck passes through a curve, thereby reducing noise and abrasion and increasing the adhesive force of the curve. The central pin type forced steering radial mechanism is provided with a frame, the truck is connected with a car body through the central pin and supports the car body upward and elastically, and the central pin type forced steering radial mechanism is also provided with two sets of wheel pairs and the radial adjustment mechanism. The radial adjustment mechanism is provided with a central rotating disc, a group of vertical push rods are respectively connected with the end part of the central rotating disc, and theother end of each vertical push rod is connected with a rotating arm. The rotating arm is connected with a positioning sleeve and forms a first positioning point on the truck side sill through the positioning sleeve, and the rotating arm is connected with the positioning sleeve and forms a second positioning point on the truck transom through the positioning sleeve. Two sets of tie rods are respectively connected with the ratating arm, and the other end of the each tie rod is connected with the axle box of front and rear wheel pairs.