The invention discloses an engine and an air inlet electromagnetic valve of the engine. The air inlet electromagnetic valve comprises a valve body and a valve cavity formed in the valve body; and an armature is assembled in the valve cavity in a guidance movement manner in the axial direction, and an air inlet, an air outlet and an exhaust opening which are communicated with the valve cavity are formed in the valve body; the air inlet and the exhaust opening are located in the two ends of the armature, an exhausting sealing structure is arranged at one end, facing the exhausting opening, of the armature, and an air inlet sealing structure is arranged at the opposite end; and an air inlet channel and/or an exhausting channel are/is formed in the armature or the position between the periphery of the armature and the inner wall of the valve body. Through movement of the armature in the valve cavity, one of the air inlet and the exhausting opening can be directly selected to be communicated with the air outlet, on the basis that the armature in the electromagnetic valve keeps the original effect that the armature is magnetized by a working coil to move, the armature can replace a valve element to achieve opening and closing control over the air inlet and the exhausting opening, meanwhile, space on the valve body can be sufficiently used by the arrangement manner of the air inlet and the exhausting opening in the electromagnetic valve, and therefore the electromagnetic valve has the beneficial effect of being small in size.