The invention relates to a buffer using elastic colloid as buffer medium and capable of displaying medium temperature. The buffer is composed of a first-level buffer and a last-level buffer; each of the first-level buffer and last-level buffer comprises a cylindrical cylinder body, a cylinder cover is hermetically arranged at the opening end of the cylinder body, a piston rod is hermetically, movably and fitly arranged in a central through hole of the cylinder cover, a piston body component is arranged at the right end of the piston rod, the piston body component is suitable for performing piston motion in the cylinder body, and the piston body component is movably and hermetically matched with the inner wall of the cylinder body; the cylinder body of the first-level buffer forms the piston rod of the last-level buffer; a sensor group is arranged on the right head face of each of the piston body components of the first-level buffer and last-level buffer, the sensor group comprises a temperature sensor suitable for detecting medium temperature, and the temperature sensor is connected with a processor module; a liquid crystal display module is arranged on the outer barrel wall of the two-level buffer, and the processor modules are suitable for displaying the medium temperature through the liquid crystal display module.