The utility model relates to a liquid fuel pump for the engine, in particular to a double-liquid fuel pump, which can spray two kinds of liquid fuel, or can spray one kind of liquid fuel and a combustion-supporting liquid additive, aiming at two kinds of liquid fuel or one is liquid fuel and another is combustion-supporting liquid additive are provided to the engine, thus realizing that one spray pump can supply two kinds of high pressure liquid. The technique proposal is that: a double-liquid high pressure pump is composed of low pressure fuel cavities, high pressure subassemblies and speedometers mechanism. The amount of the low pressure fuel cavity is at least two sets, as well as the speedometers. The number of the high pressure subassemblies installed in each low pressure fuel cavity is the same and is corresponding to the number of the cylinders in the engine. The number of the fuel pumps is corresponding to the number of the number of the low pressure fuel cavities. The double-liquid fuel pump can supply two-way high pressure liquid, under the state of no changing of the installation and drive mode for the original engine.