The utility model discloses a subsea template installing and guiding device of a blowout preventer, which comprises a guiding rope and a positioning component which are installed in a direction peg of the blowout preventer, wherein the a hanging component is arranged on the lower end of the guiding rope, a heaving compensating tensioner is arranged on the guiding rope, the positioning component is arranged around the subsea template, the hanging component and the positioning component are mutually matched to finish installing and guiding the blowout preventer, and the blowout preventer is pieced with a well head accurately after the blowout preventer is arranged in water. The device can completely replace a guiding substrate with simple operation, rapidness, convenience, low cost and repeated uses.