a shell, having a cavity disposed above a user's head;

a laser emitting assembly, comprising light sources, a first circuit board and multiple second circuit boards; said first circuit board is disposed in said shell at a position aligned at a center of a user head; said multiple second circuit boards are multiple rings with concentric axes, arranged up and down, in adjacent two rings, an outer diameter of one at below is bigger than that of the other at above; a gap is arranged between said adjacent two rings; said light sources are evenly distributed on an end surface, facing said user's head, of said first circuit board and those of said second circuit boards; said first circuit board and each of said second circuit boards are provided with a driving circuit, respectively; said light sources are electrically connected with said corresponding driving circuit;

a control system, comprising a circuit control and a multi-group of independent control units electrically connected with said circuit control; all said independent control units are electrically connected to said corresponding driving circuit of said second circuit boards and that of said first circuit board, respectively;

wherein said shell includes a base and a frame; said cavity is formed in said base, said frame is disassembly connected with an end of said base away from said cavity; said first circuit board and said second circuit boards are arranged between said base and said frame; said base is provided with multiple of through holes, each aligned to one of said corresponding light sources, said lights of said light sources can pass through said through holes and enter said cavity.