A laser generator comprising: a laser tube configured to generate a first laser beam; a beam splitter configured to receive the first laser beam; wherein the beam splitter comprises a transmission region configured as a through-hole, wherein the through-hole is configured to allow transmission of a first laser beam that is received; and wherein the first laser beam is transmitted by the through-hole of the beam splitter to form a second laser beam, characterized in that: the beam splitter further comprises a reflective region arranged at a periphery of the through-hole, and the reflective region is configured to reflect the first laser beam that is received; the laser generator further comprises: a reflective sheet and an energy monitoring unit, wherein the first laser beam that is received is reflected by the reflective region of the beam splitter to form a third laser beam; the reflective sheet is configured to change a direction in which the third laser beam is transmitted such that the third laser beam is transmitted to the energy monitoring unit; and the energy monitoring unit is configured to detect an energy of the third laser beam and generate a feedback control signal according to the energy of the third laser beam, such that an operator can timely adjust the energy of the first laser beam generated in the laser tube according to the feedback control signal. a laser tube configured to generate a first laser beam; a beam splitter configured to receive the first laser beam; wherein the beam splitter comprises a transmission region configured as a through-hole, wherein the through-hole is configured to allow transmission of a first laser beam that is received; and wherein the first laser beam is transmitted by the through-hole of the beam splitter to form a second laser beam, characterized in that: the beam splitter further comprises a reflective region arranged at a periphery of the through-hole, and the reflective region is configured to reflect the first laser beam that is received; the laser generator further comprises: a reflective sheet and an energy monitoring unit, wherein the first laser beam that is received is reflected by the reflective region of the beam splitter to form a third laser beam; the reflective sheet is configured to change a direction in which the third laser beam is transmitted such that the third laser beam is transmitted to the energy monitoring unit; and the energy monitoring unit is configured to detect an energy of the third laser beam and generate a feedback control signal according to the energy of the third laser beam, such that an operator can timely adjust the energy of the first laser beam generated in the laser tube according to the feedback control signal. the beam splitter further comprises a reflective region arranged at a periphery of the through-hole, and the reflective region is configured to reflect the first laser beam that is received; the laser generator further comprises: a reflective sheet and an energy monitoring unit, wherein the first laser beam that is received is reflected by the reflective region of the beam splitter to form a third laser beam; the reflective sheet is configured to change a direction in which the third laser beam is transmitted such that the third laser beam is transmitted to the energy monitoring unit; and the energy monitoring unit is configured to detect an energy of the third laser beam and generate a feedback control signal a reflective sheet and an energy monitoring unit, wherein the first laser beam that is received is reflected by the reflective region of the beam splitter to form a third laser beam; the reflective sheet is configured to change a direction in which the third laser beam is transmitted such that the third laser beam is transmitted to the energy monitoring unit; and the energy monitoring unit is configured to detect an energy of the third laser beam and generate a feedback control signal according to the energy of the third laser beam, such that an operator can timely adjust the energy of the first laser beam generated in the laser tube according to the feedback control signal.