The invention provides a reinforcement type hydraulic pivotal bearing of a vehicle, wherein a ring flange I in a sleeve is connected with a connecting ring flange in a bearing through a bolt; 12*[phi]10 holes II in the ring flange are connected with the connecting ring flange in the bearing through bolts; 12*[phi]21 holes I in the ring flange are connected with a connecting seat of a front trailer; a connecting pin is connected with a connecting block in the bearing through a bolt. When a piston cylinder of a hydraulic cylinder coaxially cooperates with an up-down lug seat and a left-right lug seat, the connecting pin is fixedly arranged on the lug seats by bolts; when a trailer encounters conditions that a ground surface is complicated and a working environment is serve, the piston cylinder of the hydraulic cylinder, the up-down lug seat and the left-right lug seat can each cooperate telescopically.