The invention discloses an annular micropore flow-increasing type rhombus piezoelectric energy harvesting device, which is used to solve a problem of a piezoelectric energy harvesting device used for converting gas energy in industrial environment of low energy conversion efficiency. The annular micropore flow-increasing type rhombus piezoelectric energy harvesting device comprises a micropore flow-increasing device and a rhombus piezoelectric energy harvesting device, which are tightly connected together by a fastening screw. The micropore flow-increasing device is used to increase flow of high pressure small flow gas, and the rhombus piezoelectric energy harvesting device is used to convert the pressure energy of the gas into electric energy. By adopting the annular micropore flow-increasing type rhombus piezoelectric energy harvesting device, the gas flow is increased, and the pressure energy of the gas having the increased gas flow is harvested, and therefore the electric energy generating efficiency of the piezoelectric energy harvesting device is obviously increased by more than three times. An energy management circuit is used for rectifying the generated electric energy, and is used for constantly and effectively supplying low power consumption electronic equipment with power. The annular micropore flow-increasing type rhombus piezoelectric energy harvesting device has a wide application prospect in a low power consumption electronic equipment energy supply field, an Internet of Things node energy supply field, and a low power consumption sensor energy supply field.