Safety heat pipe

The invention relates to a safety heat pipe. The safety heat pipe comprises a heat pipe shell, a capillary liquid sucking core arranged on the inner wall of the heat pipe shell, and a sealing assembly used for sealing an opening in the opening end of the heat pipe shell. The sealing assembly comprises a metal sealing pad, a first metal sealing layer, a second metal sealing layer and a centre. The metal sealing pad, the first metal sealing layer and the second metal sealing layer are sequentially compounded into a whole. The centre is detachably fixed to the sealing assembly. The sealing assembly is provided with a through hole matched with the centre in size and shape. One end of the centre penetrates through the through hole in the sealing assembly and enters in a cavity in the heat pipe shell. The melting point of the heat pipe shell is T1; the melting point of the metal sealing pad is T2; the melting point of the first metal layer is T3; the melting point of the second metal sealing layer is T4; T1>=T2>T3>T4, and T3-T4>=100 DEG C. The safety heat pipe has the advantage that the safety performance is good.