The invention relates to a high bearing capacity road marking light-emitting and power supply device. The high bearing capacity road marking light-emitting and power supply device is characterized in that an intermediate active plate is connected with a flat plate by virtue of a stressed spring, a side plate is fixed in a road surface and is connected with the flat plate, a pressure plate is connected with a connecting rod and a buffer spring, one end of the buffer spring is fixed on the shell of a transducer, the other end of the buffer spring is fixed on the pressure plate, and a piezoelectric stack is fixed on the shell of the transducer; a sliding chute is formed inside the shell of the transducer; the piezoelectric stack is composed of multiple piezoelectric ceramic wafers which are bonded by virtue of epoxy glue. The high bearing capacity road marking light-emitting and power supply device can convert pressure produced by various vehicles travelling on a road into shock vibration of the piezoelectric stack, further electrical and mechanical conversion of the device is realized, and electric energy can be provided for various light-emitting marking devices arranged on the road; and the pressure produced by various vehicles travelling on the road is transmitted by virtue of a rack pinion and then is converted into the shock vibration on the piezoelectric stack, so that the device can not destroy the piezoelectric stack even under the condition of bearing a relatively high load, and corresponding problems are solved.