The invention discloses an energy-saving constant-temperature contractile hot plate. A through hole penetrating through a hot plate body is formed in the side face of the hot plate body, silicon carbide seal strips are arranged at the two ends of the through hole, and a plurality of temperature measuring holes are formed above the through hole. A constant-temperature working area is arranged on a surface plate of the hot plate body, contractile supporting columns are movably installed on a back plate of the hot plate body, and a heat insulation plate used for positioning the multiple contractile supporting columns is arranged below the hot plate body; a multi-point acquisition and control system comprises a temperature control box and a plurality of temperature sensors connected with the temperature control box, and the multiple temperature sensors are inserted in the temperature measuring holes respectively and used for acquiring the temperature of the constant-temperature working area. According to the energy-saving constant-temperature contractile hot plate, temperature data of the hot plate body are acquired in a multi-point mode through the temperature sensors, the temperature control box compensates for the temperature of the constant-temperature working area by having control over voltage, the stable reaction time of a sample is prolonged to the maximum extent, the working efficiency of a tester is improved, and the tester does not have to wait at all at work.