The invention relates to the technical field of erosion corrosion protection of an oil-gas mixture transportation pipeline, in particular to an equal-flow multilevel flow rate mixture transportation pipeline erosion field test apparatus. The test apparatus comprises an oil-gas well, wherein a wellhead of the oil-gas well is connected with one end of a collection and transportation pipeline, and the other end of the collection and transportation pipeline is connected with an established oil-gas well yield measuring apparatus; one end of a Q-flow equal-caliber test pipe section is connected withan inlet pipeline, and the other end is connected with a 1/2Q flow equal-caliber equal-length constant-flow-rate test pipe section by virtue of a primary distribution point; and the other end of the1/2Q flow equal-caliber equal-length constant-flow-rate test pipe section A is connected onto a secondary distribution point by virtue of a plurality of straight-pipe-section test member and an elbowtest member and separately connected with one end of a 1/4Q flow equal-caliber equal-length constant-flow test pipeline B and one end of a 1/4Q flow equal-caliber equal-length constant-flow-rate testpipe section D by virtue of the secondary distribution point. The test apparatus provided by the invention has the advantages of simple structure, convenience in operation and management, safety and reliability in operation, low investment and the like.