Multi-function draw bar set for tow truck

The utility model relates to the multi-function draw bar set for tow truck, comprising a head of drawing used for connecting machines being towed, a main hydraulic cylinder used for braking under pressures and a buffer spring. The two terminals of the buffer spring are connected to the drawing head and stress point of the main hydraulic pump. The buffer spring shares the same base with the main hydraulic pump. The utility model applies to semi-trailer in golf course. A supporting facility of semi-trailer under the condition that no the air source, hydraulic power source, or air source and hydraulic power source are not suitable to provide brake Kinetic energy for the tow truck. The draw bar can be as the braking controller if the pulling type facilities are needed to be equipped with braking set in golf course. The utility model can solve the problem of the tow trucks unit being not reversing caused by inertia brake. The butter spring being set on joints reduce the damage on spare parts caused by joints collision when driving suddenly.