A kind of actinobacillus device of fishing boat, including an ontology, a power device and a sender unit is arranged in the one side that ontology has, the fixed supporting plate of the binding end that ontology has, the first surface that supporting plate has is pivoted a driving wheel, is further arranged two on supporting plate and compresses wheel, when the driving wheel rotates, active train cooperation respectively compress wheel pull fishline enter it is marine, and sender unit system detecting driving wheel rotation circle number so that calculate enter marine fishline length. 一種漁船用的放線裝置，包括一本體，本體具有的一側面設置一動力裝置與一發信器，本體具有的一結合端固設一架設板，架設板具有的一第一表面樞設一主動輪，架設板上進一步設置二抵壓輪，當主動輪轉動時，主動輪係配合各抵壓輪拉動釣線進入海中，而發信器係偵測主動輪旋轉的圈數進而推算進入海中之釣線的長度。
