A hydraulic brake device comprising: a driving device is provided with a pushing block, and the pushing block is located in the cavity room of the housing, said driving device can drive the pushing block to move within the cavity room of the housing; a housing is provided with a cavity room; a first pump mechanism is mounted in the casing, the first pump mechanism is provided with a first piston and a first chamber below the pushing block, the first piston is arranged in the first chamber, an interval space is formed between the first chamber and the pushing block, the upper end of said first piston is extended out of the first chamber, and the upper end of said first piston is pressed against the lower end of the pushing block; said pushing block can drive the first piston and output the first braking force to the rear wheel brake; a second pump mechanism is mounted in the casing, the second pump mechanism is provided with a second piston and a second chamber below the pushing block, the second piston is arranged in the second chamber, an interval space is formed between the second chamber and the pushing block, the upper end of said second piston is extended out of the second chamber, and characterized in that the upper end of the second piston and the lower end of the pushing block have a separation distance; said pushing block can drive the second piston and output the second braking force to the front wheel brake; so that, by a time difference brake outputted by the first pump mechanism and the second pump mechanism, the rear wheel brake and the front wheel brake can generate a time difference braking action; then, to let the second braking force output by the second pump mechanism greater than the first braking force output by the first pump mechanism, the braking force of the front wheel brake can be greater than the braking force of the rear wheel brake to improve the safety of the vehicle. a driving device is provided with a pushing block, and the pushing block is located in the cavity room of the housing, said driving device can drive the pushing block to move within the cavity room of the housing; a housing is provided with a cavity room; a first pump mechanism is mounted in the casing, the first pump mechanism is provided with a first piston and a first chamber below the pushing block, the first piston is arranged in the first chamber, an interval space is formed between the first chamber and the pushing block, the upper end of said first piston is extended out of the first chamber, and the upper end of said first piston is pressed against the lower end of the pushing block; said pushing block can drive the first piston and output the first braking force to the rear wheel brake; a second pump mechanism is mounted in the casing, the second pump mechanism is provided with a second piston and a second chamber below the pushing block, the second piston is arranged in the second chamber, an interval space is formed between the second chamber and the pushing block, the upper end of said second piston is extended out of the second chamber, and characterized in that the upper end of the second piston and the lower end of the pushing block have a separation distance; said pushing block can drive the second piston and output the second braking force to the front wheel brake; so that, by a time difference brake outputted by the first pump mechanism and the second pump mechanism, the rear wheel brake and the front wheel brake can generate a time difference braking action; then, to let the second braking force output by the second pump mechanism greater than the first braking force output by the first pump mechanism, the braking force of the front wheel brake can be greater than the braking force of the rear wheel brake to improve the safety of the vehicle.