The invention discloses a compression ignition engine system using single methanol fuel, comprising: a compression ignition engine (1) comprising a cylinder assembly comprising a cylinder (2), a glowplug (6), an intake passage (7), an exhaust passage (19) and a fuel nozzle (3); a gas supply system that comprises a supercharger (14) and a gas inlet pipe (9) which are sequentially connected in series, wherein a heating mixing section (10) is arranged in the middle of the gas inlet pipe (9), and the heating mixing section (10) is connected with an ignition agent nozzle (11); and an exhaust system that comprises an exhaust pipe (5), wherein an inlet of the exhaust pipe (5) is connected to the exhaust passage (19), and an outlet of the exhaust pipe (5) is connected to the supercharger (14). The mixed gas of methanol and air is used as the ignition agent, methanol is used as fuel, normal operation of the compression ignition type engine system is achieved, the whole combustion process is controllable and efficient, and application of single methanol fuel to a diesel engine is achieved.