Photonic crystal lasers can further reduce the optical mode volume and the lasing threshold using the band gap effect and localized effect, which can meet the needs of device miniaturization and optoelectronic integration. Photonic crystal lasers have broad application prospects in light-emitting diodes, sensors and other aspects, so they have attracted much attention. The lasing threshold is defined as the minimum energy density of lasing oscillation and is an important index for the integrated application of laser devices. Perovskite material has the characteristics of high optical gain, which makes it an ideal gain material for realizing low threshold laser. When combined with photonic crystal laser, low threshold or no threshold pumping lasing can be realized. Based on the resonator and gain medium, the two factors (gain and loss), which are the two main factors affecting the threshold of the laser, are briefly described in terms of the resonant cavity and the gain medium, and some methods to reduce the threshold is proposed. Then, photonic crystal lasers are classified according to the dimension and structure of photonic crystals. In addition, the research progress of low threshold of perovskite photonic crystal lasers is reviewed. Finally, the development prospect of perovskite photonic crystal lasers is prospected, in order to achieve low threshold or even zero threshold, high power, high quality lasing output, and promote the integration and multi-field application of semiconductor lasers