The invention discloses an ultrahigh-pressure pipeline system with a combined type check valve. The ultrahigh-pressure pipeline system comprises a base. A liquid inlet main flow channel and a liquid outlet main flow channel are formed in the two sides of the base. A first convergence flow channel, a second convergence channel and a plurality of branches are arranged between the liquid inlet main flow channel and the liquid outlet main flow channel. The branches are provided with liquid inlets and liquid outlets. The liquid inlets are connected with the first convergence flow channel. The liquid outlets are connected with the second convergence channel. The first convergence flow channel is communicated with the liquid inlet main flow channel. The second convergence channel is communicated with the liquid outlet main flow channel, and the drift diameter of each branch is less than the drift diameter of the liquid inlet main flow channel and the drift diameter of the liquid outlet main flow channel. The ultrahigh-pressure pipeline system further comprises the combined type check valve. The combined type check valve comprises independent check valve bodies of which the number is equal to that of the branches, and each branch is internally provided with an independent check valve body. The base is further provided with a detection branch. The detection branch comprises a low-pressure branch and a high-pressure branch.