The invention discloses a mining support with supporting stiffness capable of being automatically adjusted. The mining support has good impact resistance and energy absorption effects, and the supporting stiffness of the support or nearby supports can be adjusted in real time according to the difference of local impact ground pressure at multiple positions. The mining support comprises top supporting assemblies. The top supporting assemblies connected with supporting columns through buffer connecting assemblies, and the bottoms of the supporting columns and bases are assembled and fixed through the buffer supporting assemblies. The buffer supporting assemblies between every two adjacent supports are connected through second high-pressure oil pipes. When the top supporting assemblies generate the impact ground pressure, the impact ground pressure can be rapidly absorbed through movable supporting plates, avoiding is rapidly carried out, and the top supporting assemblies are prevented from being directly crushed. The buffer supporting assemblies between the adjacent supports are connected through the second high-pressure oil pipes, when the impact ground pressure occurs in the local portion of the top of a roadway, the supporting rigidity of other supports connected with the impacted support can be instantly improved.