The invention relates to a dual-fluid mixing proportioning pump which is characterized in that a blocking jacket dividing the plunger-type cylinder into two cylinder bodies in a sealing way is arranged in a plunger-type cylinder; both the plunger-type cylinder and the blocking jacket are provided with ventilation holes; each end of the blocking jacket is provided with a plunger and a compression spring in a contacting way; a push rod is sleeved in the blocking jacket, and the tips of the push rod are respectively contacted and propped with the two plungers; one plunger is provided with precise through holes matched with the push rod in a closed way; and the end tail of the push rod is connected with the slider on the engine base; two source fluid containers are respectively connected with the fluid inlets of the cylinder at the both sides of the blocking jacket through two one-way valves, and the fluid outlets of the cylinder at the both sides of the blocking jacket are connected with another two one-way valves respectively and output to the mixed fluid container. The dual-fluid mixing proportioning pump is reasonably designed to achieve the function of mixing two fluids based on a certain proportion, overcomes the problems of using two plungers in the prior art and has the characteristics of simple structure, low cost, stable performance and convenient use.