The invention discloses a universal simulator for aircraft engines. The universal simulator comprises an upper industrial 
personal computer, a 
simulation measurement and control computer, a display control 
desk, a combination instrument case with a plurality of instrument 
hardware modules, an instrument extension case, a 
signal adaptation unit, a direct-
current voltage-stabilized source and a special testing cable. The universal simulator has the advantages that mathematical models of the engines are operated by an embedded high-performance real-time 
operating system of the 
simulation measurement and control computer, so that the real-time performance and the effectiveness of 
simulation experiments can be guaranteed; hardware architectures for forming testing systems are standard PXI [PCI (
peripheral component interconnect) extensions for 
instrumentation] 
bus open architectures, accordingly, the 
hardware modules of various mature PXI 
bus interfaces can be extended and configured according to particular testing application, and the universal simulator is high in 
automation degree, 
extensibility and compatibility and good in 
maintainability; the 
signal adaptation unit is configured with standard and universal electric connectors by means of integration, and only corresponding matched testing connecting cables need to be replaced, so that electric connection of the testing systems can be quickly reconstructed by the simulator for the engines, and requirements of platforms on the universality can be met.