The invention discloses a vehicle-mounted capstan system easy to adjust in direction. The vehicle-mounted capstan system is characterized in that the vehicle-mounted capstan system comprises a hook and a press block; the lower portion of the hook is connected with a connection block; the connection block is connected with a traction rope; side plates are arranged on the lower half sections of thefront and rear sides of the back portion of the hook; end plates are connected to the lower ends of the side plates; the side plates protrude out of the back portion of the hook, and thus limiting grooves are formed, and the press block is arranged in the limiting grooves in a matched mode and pressed on the back portion of the hook; an upper bevel is formed at the outer edge chamfer of the upperend of the press block, and a lower bevel is formed at the outer edge chamfer of the lower end of the press block; an upper jacking block is fixedly connected to the upper end of the back portion of the hook and provided with a bevel making face contact with the upper bevel; a lower jacking block is arranged between the side plates and provided with a bevel making face contact with the lower bevel; and the lower jacking block is arranged on guide rails extending up and down on the side plates in a matched mode through guide grooves. Moving of the traction rope is avoided, directivity is good,the vehicle-mounted capstan system can supply appropriate traction to a vehicle, and it is guaranteed that the vehicle gets out of the trap safely.