Self-heating anti-blocking drip irrigation tape with externally-attached drippers and anti-blocking drip irrigation method

The invention discloses a self-heating anti-blocking drip irrigation tape with externally-attached drippers. The self-heating anti-blocking drip irrigation tape comprises a drip irrigation lower shell installed on the surface of a drip irrigation tape pipeline, holes are formed in the surface of the drip irrigation tape pipeline and communicate with the water inlet end of the drip irrigation lower shell, a drip irrigation upper shell is installed above the drip irrigation lower shell, the water inlet end of the drip irrigation upper shell communicates with the water outlet end of the drip irrigation lower shell, two fixed racks are fixedly arranged at opposite positions in the drip irrigation upper shell, a labyrinth flow channel is formed between opposite teeth of the two fixed racks, an expandable transparent light gathering body is arranged above the labyrinth flow channel, the water inlet end of the labyrinth flow channel and the water inlet of the expandable transparent light gathering body both communic