The invention provides a nuclear power plant main pump integrated verification test device, comprising a first test circuit having a first valve assembly and a second test circuit having a second valve assembly, the first test circuit and the second test circuit being isolated from each other and connected in parallel; further comprising an auxiliary system, the first test circuit and the second test circuit share the auxiliary system, and the auxiliary system is respectively connected in parallel with the first test circuit and the second test circuit, and the auxiliary system is used for thefirst test circuit or the second test circuit to provide the medium for the circuit required for the test; when the first valve assembly is opened and the second valve assembly is closed, the first test circuit is used for a small flow test; when the first valve assembly is closed and the second valve assembly is opened, the second test circuit is used for a full flow test. The invention is an integrated verification test device which can be used for carrying out the small flow test and the full flow test of different types of main pumps to solve the problem of high construction cost and lowutilization rate of the main pump integrated verification test device.