Hydraulic system of school bus

The utility model pertains to the technical field of vehicles and provides a hydraulic system of a school bus which helps to the technical problem that safety performance is not enhanced due to a complicated hydraulic structure of a current school bus. The hydraulic system of the school bus is characterized in that the school bus comprises an outer carriage and an inner carriage; the hydraulic system comprises multiple first hydraulic cylinders whose cylinder bodies are fixedly connected with the outer carriage; the hydraulic system further comprises second hydraulic cylinders in a one-to-one correspondence with the first hydraulic cylinders; piston rods of the second hydraulic cylinders are inserted on the outer carriage which is fixedly provided with a support plate; cylinder bodies of the second hydraulic cylinders are fixedly arranged on the support plate; the second hydraulic cylinders are provided with second liquid-storing chambers which is connected with a first liquid-storing chamber via hydraulic pi