The invention relates to a heat collecting pipe disconnection valve. The heat collecting pipe disconnection valve comprises a barrel-shaped valve body shell which comprises a water inlet end and a water draining end; a water draining plate, a pressure induction assembly and a water guiding ring are arranged in the valve body shell; a pressure induction assembly body comprises a pressure ring; a plurality of water draining holes A are formed between the outer wall of the pressure ring and the inner wall of the valve body shell; a leaf spring is fixed to the end portion of the pressure ring; the water draining plate is fixed to the position, corresponding to the water inlet end, of the valve body shell; a spherical-face-shaped water seeping groove corresponding to the leaf spring is formed in the middle portion of the water draining plate and is provided with a plurality of water draining holes B; when the leaf spring is in the compressed state, the leaf spring is folded towards the water draining end of the valve body shell and is embedded into the water seeping groove; the water guiding ring is of a gradual shrinkage structure; the flaring end of the water guiding ring is fixed to the position of the water inlet end of the inner wall of the valve body shell; the necking-down end of the water guiding ring faces the water draining end; and a water draining gap is reserved between the necking-down end of the water guiding ring and the end portion of the pressure ring.