The invention belongs to the technical field of 5G communication, and particularly relates to a testing device and a testing method for 5G core network infrastructure. The testing device comprises a main controller, and a testing submodule, a caching module, a testing result display module and a Web configuration interface module which are respectively connected with the main controller; the datastorage module is respectively connected with the caching module and the testing result display module, the main controller comprises a self-adaptive configuration module, a Web management module, a sub-module control module and an interface calling module. The testing method comprises the following steps of testing the NFVI of a 5G core network aiming at the function and the performance testing of a virtual resource pool NFVI, and by adopting a micro-service architecture and a non-intrusive mode, and carrying out a virtual interface consistency test, a virtual machine VM connectivity test, anIPv6 related test, a high-availability HA test, a network function service chain SFC test, a network element NF life cycle management test and a two-layer and three-layer network performance test.