The invention relates to an automatic compensation flexible mechanism. A profiling carrier is fixed to a connecting plate through fixing blocks. The profiling carrier is obliquely arranged on the connecting plate. A product positioning module and two side clamping mechanisms are arranged on the profiling carrier and used for positioning an irregular product. The product is internally provided with a hemispherical hot melting area. A circular filter screen can be fused to the hot melting area through hot pressing. An automatic adjusting and floating mechanism capable of automatically compensating for an error generated when a pressure head is aligned with the product in the hot-pressing fusion process is arranged below the connecting plate. By adopting the automatic compensation flexible mechanism, in the product press-fitting process or in the press-fitting process of a hot melting jig, hot melting is conducted through the hot pressing fusion method, and a profiling hot melted position in the product provides soft contact for bearing the profiling carrier to compensate the error for the automatic adjusting and floating mechanism and compensate the error generated when the pressure head is aligned with the product through the automatic adjusting and floating mechanism so that the filter screen and the product can be fused completely. The automatic compensation flexible mechanism is fixed to a press fitting jig. The mechanism is accurate and stable and can be designed according to different products.