Portable manual mouth-used breathing machine

The utility model relates to a portable manual mouth-used breathing machine belonging to the technical field of manufacturing medical rescuing equipment. The portable manual mouth-used breathing machine consists of a bracket, a shaft sleeve, an eccentric wheel, a rotating shaft, a crank, a connecting rod, a gas cylinder, a piston, a check valve, a ventilation pipe and a breathing mask, wherein the shaft sleeve and the gas cylinder are connected with the bracket; the eccentric wheel and the rotating shaft are connected with the connecting rod; the rotating shaft is connected with the crank; one end of the connecting rod is connected with the piston and the other end thereof is connected with the eccentric wheel; the gas cylinder is arranged in the piston; the check valve is arranged on the piston; and one end of the ventilation pipe is connected on the top end of the gas cylinder and the other end thereof is connected with the mask. When in use, the breathing mask is arranged on the face of a patient and a lac