The utility model discloses an integrated hydraulic unit of an automobile braking system. The hydraulic unit comprises a hydraulic valve block, a main braking cylinder, a motor, two hydraulic pumps, two switch valves, a second switch valve, four pressurizing valves, four reducing valves, an oil storage chamber and a pressure sensor, wherein the main braking cylinder, the motor, the two hydraulic pumps, the two switch valves, the second switch valve, the four pressurizing valves, the four reducing valves, the oil storage chamber and the pressure sensor are arranged on the hydraulic valve block. A main braking cylinder body is integrated in the hydraulic valve block. A main braking cylinder piston is arranged in the main braking cylinder body and connected with a braking pedal through a push rod. The motor is arranged on the hydraulic valve block and connected with the hydraulic pumps. The oil storage chamber is connected with the hydraulic valve block, connected with two oil inlets of the main braking cylinder body through an oil channel of the hydraulic valve block as well as connected with outlets of the reducing valves and oil inlets of the hydraulic pumps. The integrated hydraulic unit of the automobile braking system is simple and compact in structure, low in cost, environmentally friendly, energy-saving, wide in application range, powerful in function, rapid in construction of braking hydraulic pressure and beneficial to shortening a braking distance and improves driving safety, can be applied to a traditional automobile as well as a new energy automobile.