A method for continuous production of a polycarbonate-polyorganosiloxane copolymer comprising the steps of: withdrawing a polymerization reaction solution obtained by polymerizing a dihydric phenol compound represented by the following general formula, a carbonate precursor, and a polyorganosiloxane represented by the following general formula in the presence of an alkaline compound aqueous solution and a water-insoluble organic solvent continuously or intermittently from a reactor; separating the polymerization reaction solution withdrawn in the step into an aqueous phase and a water-insoluble organic solvent phase; and after washing the water-insoluble organic solvent phase separated in the step with an acidic aqueous solution, separating the resultant into an aqueous phase and a water-insoluble organic solvent phase, wherein the content of the polycarbonate-polyorganosiloxane copolymer in the aqueous phase separated in the step is controlled to not more than 2% by mass, and a part or the whole of an extract obtained by extracting the aqueous phase separated in the step with a water-insoluble organic solvent is reused for the step: in the formula, each of R 1 and R 2 independently represents a halogen atom, an alkyl group having from 1 to 6 carbon atoms, or an alkoxy group having from 1 to 6 carbon atoms; X represents a single bond, an alkylene group having from 1 to 8 carbon atoms, an alkylidene group having from 2 to 8 carbon atoms, a cycloalkylene group having from 5 to 15 carbon atoms, a cycloalkylidene group having from 5 to 15 carbon atoms, -S-, -SO-, -SO 2 -, -O-, or -CO-; and each of a and b independently represents an integer of from 0 to 4, in the formula, each of R 3 to R 6 independently represents a hydrogen atom, a halogen atom, an alkyl group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or an aryl group having from 6 to 12 carbon atoms; Y represents a single bond, or an organic residue containing an aliphatic or aromatic moiety; n is a an average repeating number; Z represents a halogen atom, -R 7 OH, -R 7 -Z'-R 8 -OH, -R 7 COOH, -R 7 NH 2, -COOH, or -SH; R 7 represents a substituted or unsubstituted alkylene group, a substituted or unsubstituted cycloalkylene group, or a substituted or unsubstituted arylene group; R 8 represents an arylene group having from 6 to 12 ring-forming carbon atoms; Z' represents an alkylene group having from 1 to 8 carbon atoms, an alkylidene group having from 2 to 8 carbon atoms, a cycloalkylene group having from 5 to 10 carbon atoms, or a cycloalkylidene group having from 5 to 10 carbon atoms; and m is 0 or 1. withdrawing a polymerization reaction solution obtained by polymerizing a dihydric phenol compound represented by the following general formula, a carbonate precursor, and a polyorganosiloxane represented by the following general formula in the presence of an alkaline compound aqueous solution and a water-insoluble organic solvent continuously or intermittently from a reactor; separating the polymerization reaction solution withdrawn in the step into an aqueous phase and a water-insoluble organic solvent phase; and after washing the water-insoluble organic solvent phase separated in the step with an acidic aqueous solution, separating the resultant into an aqueous phase and a water-insoluble organic solvent phase, wherein the content of the polycarbonate-polyorganosiloxane copolymer in the aqueous phase separated in the step is controlled to not more than 2% by mass, and a part or the whole of an extract obtained by extracting the aqueous phase separated in the step with a water-insoluble organic solvent is reused for the step: in the formula, each of R 1 and R 2 independently represents a halogen atom, an alkyl group having from 1 to 6 carbon atoms, or an alkoxy group having from 1 to 6 carbon atoms; X represents a single bond, an alkylene group having from 1 to 8 carbon atoms, an alkylidene group having from 2 to 8 carbon atoms, a cycloalkylene group having from 5 to 15 carbon atoms, a cycloalkylidene group having from 5 to 15 carbon atoms, -S-, -SO-, -SO 2 -, -O-, or -CO-; and each of a and b independently represents an integer of from 0 to 4, in the formula, each of R 3 to R 6 independently represents a hydrogen atom, a halogen atom, an alkyl group having from 1 to 6 carbon atoms, an alkoxy group having from 1 to 6 carbon atoms, or an aryl group having from 6 to 12 carbon atoms; Y represents a single bond, or an organic residue containing an aliphatic or aromatic moiety; n is a an average repeating number; Z represents a halogen atom, -R 7 OH, -R 7 -Z'-R 8 -OH, -R 7 COOH, -R 7 NH 2, -COOH, or -SH; R 7 represents a substituted or unsubstituted alkylene group, a substituted or unsubstituted cycloalkylene group, or a substituted or unsubstituted arylene group; R 8 represents an arylene group having from 6 to 12 ring-forming carbon atoms; Z' represents an alkylene group having from 1 to 8 carbon atoms, an alkylidene group having from 2 to 8 carbon atoms, a cycloalkylene group having from 5 to 10 carbon atoms, or a cycloalkylidene group having from 5 to 10 carbon atoms; and m is 0 or 1.