The invention discloses a terahertz reflector based on a silicon meta-surface, and relates to an optical element. The reflector consists of medium blocks and a silicon dioxide substrate, and the medium blocks are cubic medium blocks and are arranged periodically, wherein the sizes of all medium blocks are the same. The width of each medium block is 170 microns, and the period is 240 microns. The working principle is that an incident wave excites a dielectric medium to perform Mie resonance to arouse the strong coupling effect of an electric field, thereby achieving the broadband total reflection. The reflector is not sensitive to polarization, and the incidence of TE and TM waves can achieve the same total reflection effect. Moreover, the reflector can be adjusted through the changing of the geometric size, and achieves the total reflection of incident waves through the control of the propagation of electromagnetic waves. The reflector is simple in structure, is wide in application range, is not sensitive to the polarization mode of incident waves, and is high in application value for the design of a photoelectric device.