The invention discloses a dynamic hydraulic pressure drip irrigation system, characterized in that, an inlet of a water pump is connected with a caml water source through a pipe, a pressure water source and a reservoir enter a trunk after being connected with an outlet of the water pump; a switch solenoid valve, a check valve, an irrigation main switch and a main filter are arranged in turn on the trunk, a solenoid valve is connected in parallel with the switch solenoid valve through a branch pipe, a fertilization switch and a fertilizer placer are connected with the irrigation main switch in parallel through the branch pipe, a fertilizer controlling valve and a fertilizer pot are connected in turn under the fertilizer placer; a pressure gauge, main filter, a filter flushing valve and a water gauge are arranged on the trunk; a douche is arranged on bottoms of different branches of the branch pipe; each valve is connected with a controller through control lines, a frequency converter is connected between the water pump and the controller. The system causes operation water pressure to change antomatically and dynamically, keeps a larger working water pressure, meanwhile, reduces practical working pressure of the drip irrigation system, also reduces operation cost of the micro irrigation system.