A high precision hydraulic synchronous and proportional flow dividing and flow collecting apparatus comprises two hydraulic motors having the same displacement and their crankshafts be connected into one crankshaft. The two hydraulic motors have a common oil inlet port, and have an individual oil exhaust port respectively. In the casing of the two hydraulic motors a plunger cylinder and a plunger piston that is matched with the plunger cylinder are provided. Between the plunger cylinder and the plunger piston an automatic compensating combined sealing unit is provided. Between the plunger piston and the linking rod lubrication damping holes are eliminated. Thereby, the leakage amount is further reduced. The advantage of the present invention are that it has the synchronous control function; the synchronous precision comes up to +-02%; it is of simple structure, high efficiency, energy saving, low cost, smooth operation noise, reliable performance and convenience in maintenance. |