The invention discloses an oil-gas dual-purpose carburetor with a manual switching function. The oil-gas dual-purpose carburetor comprises a carburetor body, wherein a venturi tube, an oil inlet tube,a float chamber and a main jet are arranged on the carburetor body; the main jet communicates with the venturi tube; the air inlet tube is used for supplying fuel oil to the float chamber; a lower shell body is connected onto the carburetor body; a regulator assembly and a switching assembly are arranged on the lower shell body; the regulator assembly is used for regulating and controlling fuel gas; the switching assembly is used for switching the fuel oil and the fuel gas, and comprises a first permanent magnet, a second permanent magnet and a switching shaft; the first permanent magnet is arranged on the switching shaft; and the switching shaft is used for enabling or cutting off a channel from the regulator assembly to a fuel gas inlet tube. The oil-gas dual-purpose carburetor has theadvantages that the switching is convenient; the level of integration is high; the automatic interlocking effect can be achieved during the fuel switching process; the performance is stable; and the reliability is high.