The invention relates to the field of tunnel and underground space equal-rock-soil dual-fluid grouting engineering, in particular to a dual-fluid-grouting-hole mixing device capable of achieving self-rotating and multi-mixing, which aims to solve the problem that dual-fluid grouting mixing in the prior art is uneven. The dual-fluid-grouting-hole mixing device comprises a tee-joint-shaped mixing bin, wherein material inlets are separately formed in the two sides of the mixing bin; the bottom of the mixing bin is equipped with a spiral runner discharge tube; a stirring mechanism is arranged in the spiral runner discharge tube; a material inlet mechanism is mounted at a material inlet; a self-rotating spray head comprises a cap-shaped rotary body, the inner wall of a blind hole in the self-rotating spray head externally extends to equip with a thread-shaped guide plate; and a circular-arc folding type spray nozzle which is designed along the threaded edge is arranged on the guide plate. The dual-fluid-grouting-hole mixing device has the advantages of achieving the purpose of sufficiently mixing slurry, accomplishing hole mixing grouting operation, and having an important practical value and a wide application prospect in most of IV-grade and V-grade surrounding rock rock-soil dual-fluid grouping engineering in China.