Abstract: A fish bite detecting and warning device for alerting a fisher when a fish has been hooked on a fishing line. The device includes a housing with a downwardly extending support shaft for insertion into the ground. The housing has at least one elongate slot therethrough. At least one primary switch is provided in the housing. The primary switch has a pivoting actuating arm which is extended through the slot of the housing. The actuating arm is pivotable between a raised position and a lowered position and is biased towards the lowered position. An outwardly extending guide member is located beneath the slot. The guide member has a plurality of grooves for receiving the fishing line looped beneath the adjacent actuating arm. A computer processor for generating signals is located in the housing and is electrically connected to the primary switch. An alerting light source is provided in the housing and electrically connected to the computer processor.