A hydraulic control device for connecting with a hydraulic fluid circuit of a vehicle, the vehicle including a left shock-absorbing device and a right shock-absorbing device, comprising: a housing; an actuator; a main pump mechanically actuated to create a fluid pressure or provide a pressurized hydraulic fluid to the hydraulic fluid circuit for locking or unlocking the left and right shock-absorbing devices (21, 22); and an actuating lever having an end which is connected with said main pump, said hydraulic control device being characterized in that said hydraulic control device further comprises: a thrust member rotatably mounted on an opposite end of said actuating lever about a thrust rotation center; and a cam rotatably mounted on said housing and actuated by said actuator to be rotated about a cam rotation center, said cam being configured to be in sliding contact with said thrust member to rotate said thrust member about the thrust rotation center when rotated, so as to transmit a working thrust to said actuating lever for said actuating lever to perform a reciprocating movement along an axial direction, which in turn actuates said main pump to create a fluid pressure or provide a pressurized hydraulic fluid to said hydraulic fluid circuit, said cam being rotatable from an initial position, where the cam rotation center is distant from the thrust rotation center by a shortest distance, to a working position, during the rotation from the initial position to the working position, when said cam is rotated toward an angular position, where a largest thrust is applied upon said actuating lever, a contact of said thrust member with said cam being brought gradually close to an extending line through the cam rotation center and the thrust rotation center once the contact is away from the extending line. a housing; an actuator; a main pump mechanically actuated to create a fluid pressure or provide a pressurized hydraulic fluid to the hydraulic fluid circuit for locking or unlocking the left and right shock-absorbing devices (21, 22); and an actuating lever having an end which is connected with said main pump, said hydraulic control device being characterized in that said hydraulic control device further comprises: a thrust member rotatably mounted on an opposite end of said actuating lever about a thrust rotation center; and a cam rotatably mounted on said housing and actuated by said actuator to be rotated about a cam rotation center, said cam being configured to be in sliding contact with said thrust member to rotate said thrust member about the thrust rotation center when rotated, so as to transmit a working thrust to said actuating lever for said actuating lever to perform a reciprocating movement along an axial direction, which in turn actuates said main pump to create a fluid pressure or provide a pressurized hydraulic fluid to said hydraulic fluid circuit, said cam being rotatable from an initial position, where the cam rotation center is distant from the thrust rotation center by a shortest distance, to a working position, during the rotation from the initial position to the working position, when said cam is rotated toward an angular position, where a largest thrust is applied upon said actuating lever, a contact of said thrust member with said cam being brought gradually close to an extending line through the cam rotation center and the thrust rotation center once the contact is away from the extending line. a thrust member rotatably mounted on an opposite end of said actuating lever about a thrust rotation center; and a cam rotatably mounted on said housing and actuated by said actuator to be rotated about a cam rotation center, said cam being configured to be in sliding contact with said thrust member to rotate said thrust member about the thrust rotation center when rotated, so as to transmit a working thrust to said actuating lever for said actuating lever to perform a reciprocating movement along an axial direction, which in turn actuates said main pump to create a fluid pressure or provide a pressurized hydraulic fluid to said hydraulic fluid circuit, said cam being rotatable from an initial position, where the cam rotation center is distant from the thrust rotation center by a shortest distance, to a working position, during the rotation from the initial position to the working position, when said cam is rotated toward an angular position, where a largest thrust is applied upon said actuating lever, a contact of said thrust member with said cam being brought gradually close to an extending line through the cam rotation center and the thrust rotation center once the contact is away from the extending line.