A spear gun safety device for shielding at least one spike of a spear is provided. The safety device may include a tube assembly having a firing end and an opposing handle end, forming a barrel through the length of the tube assembly, wherein the barrel is dimensioned and adapted to house the spear, including the at least one spike, but not including a perpendicularly joined band post. The tube assembly provides an elongated notch extending from the firing end toward the handle end, wherein the elongated notch is configured to guide the band post protruding therethrough. The tube assembly provides a pair of band connectors disposed near the firing end, each band connector straddling opposing sides of the elongate notch, whereby tension bands extend from the band connectors to the band post.