A polarization-independent "Tian" shaped dynamic unit has been designed， which is composed of vanadium dioxide （VO₂） thin films and gold patterns. Leveraging the phase transition characteristics of VO₂， the designed unit structure can effectively modulate the amplitude of incident terahertz waves. Furthermore， based on this dynamic "Tian" shaped metasurface unit structure， the other static "Tian" shaped unit structure （without VO₂） is designed in this paper for the design of encrypted holography. Simulation results show that in the insulating state， both dynamic and static unit structures produce the same amplitude modulation on the incident terahertz waves， achieving information encryption. When VO₂ transitions to the metallic state upon heating， the dynamic unit changes its original amplitude state， thus realizing polarization-independent holographic imaging. Unlike previous dynamic metasurface research based on VO₂， which mostly focused on polarization-dependent or single image switching， this work is the first to combine the dynamic regulation capability of VO₂ with the "Tian" shaped polarization-independent structure， achieving reversible， polarization-independent switching between encryption and holographic imaging， with broadband operating characteristics. This scheme has broad application prospects in dynamic optical encryption， information storage， and anti-counterfeiting fields.