Locking device for signal adapter plate of testing machine

The invention provides a locking device for a signal adapter plate of a test machine, which comprises four groups of electric push rod assemblies arranged on the outer sides of four edges of a connector group arranged in a quadrangle, and is characterized in that each electric push rod assembly comprises a mounting block, a moving block, a guide rail assembly and an electric push rod, and the moving block is mounted on the mounting block through the guide rail assembly and can move relative to the mounting block; the electric push rod drives the moving block to move; clamping grooves are formed in the top faces of the mounting blocks, sliding grooves are formed in the inner side faces of the mounting blocks, the sliding grooves communicate with the clamping grooves in a one-to-one correspondence mode, and the sliding grooves obliquely extend downwards; when the signal adapter plate assembly is arranged on the board card resource connecting plate assembly, cam followers on the four sides of the signal adapter