LED underwater fishing lamp is the most important fishing aid equipment in light-induced squid fishing, which can be divided into two categories: water lamp and underwater lamp. The underwater fishing lamp has the characteristics of energy saving, wide attraction range and deep penetration. Underwater fishing lamps can not only lure deep squid into shallow water at night, but also collect large squid in deep water during the day to catch them. Underwater fishing lamps have been widely used in squid fishing since 1990s.