The utility model provides a traction mechanism, which comprises a traction support, a traction seat, a pin roll and an inhibiting device for preventing the traction seat from being separated from the pin roll, wherein one end of the traction support is fixed on a car frame to be trailed; the other end of the traction support is connected with or separated from the traction seat; the pin roll comprises a fixed end and a connected end; the fixed end is fixedly connected onto the traction support; an inhibiting structure is arranged on a position of the pin roll close to the connected end; the inhibiting device is arranged on the traction seat and corresponds to the inhibiting structure on the pin roll; and when the traction seat is connected with the traction support, the traction seat is sleeved on the connected end of the pin roll and can be rotated around the pin roll, and the inhibiting device is engaged with the inhibiting structure on the pin roll. The inhibiting device can be also arranged on the traction seat, and the fixed end of the pin roll is fixedly connected onto the traction seat. The traction mechanism provided by the utility model is simple in structure, low in production and manufacturing cost, and convenient to connect and separate.