Pavement maintenance spraying device and system based on hydraulic driving

The invention discloses a pavement maintenance spraying device based on hydraulic driving. The device comprises a mounting platform capable of being fixed on an isolation guardrail in the middle of a highway bridge, a spray head, a liquid outlet channel, a turbine fixed on the mounting platform and provided with a liquid inlet and a liquid outlet, and a reciprocating swing structure, the liquid inlet is used for introducing maintenance liquid with pressure so that the turbine can convert liquid kinetic energy into rotating mechanical energy; the liquid outlet channel is communicated with the liquid outlet and the nozzle; a rotary output shaft of the turbine is in transmission connection with the reciprocating swing structure, and the reciprocating swing structure is connected with the spray head and drives the spray head to do 180-degree reciprocating swing under the driving of the turbine; the invention further discloses a system, in the system, the liquid inlet of each device is provided with a liquid suppl