The invention discloses a boat-oriented emergency fire pump unit with a power pump for priming water. The boat-oriented emergency fire pump unit comprises an internal combustion engine, a fire control self-priming pump, an inner combustion engine free end power output wheel, a priming pump power input wheel, a transmission flexible shaft, a priming pump, a tee joint and a main pipeline. The emergency fire pump unit is installed on a ship deck. The inner combustion engine free end power output wheel is connected with a front shaft of the free end of the internal combustion engine. The inner combustion engine free end power output wheel drives the priming pump power input wheel which is connected with the underwater priming pump through the transmission flexible shaft. A water outlet pipe and a water inlet flexible pipe are arranged on the fire control self-priming pump. The water inlet flexible pipe, the main pipeline and a water outlet of the priming pump are communicated through the tee joint. The boat-oriented emergency fire pump unit with the power pump for priming water has the advantages that the priming pump which is possessed by a boat-oriented fire pump and carries out transmission through mechanical power is used for normally booting a boat-oriented emergency fire pump to carry out emergency fire control work. The boat-oriented emergency fire pump unit is not affected by a priming range and free of manual water priming, and has the advantages of being simple in structure and convenient to use.