A medicinal liquid supply apparatus comprising: a fixed-type medicinal liquid supply volume controller connected to one end of a first medicinal liquid hose whose other end is connected to an outlet of a medicinal liquid supplier, the fixed-type medicinal liquid supply volume controller comprising: cases (41a; 41b); a medicinal liquid control line received inside the cases (41a; 41b); an inflow part and an outflow part respectively formed on the opposite ends of the medicinal liquid control line and respectively having a plurality of branch holes (43a; 44a); a controller joined to the outer face of the case (41 a or 41b); a pressure plate pressed according to a rotation angle of the controller and having a plurality of pressure pieces; and a plurality of medicinal liquid branch hoses and a medicinal liquid transfer hose respectively connected to the branch holes (43a; 44a), the medicinal liquid branch hoses being opened and closed by an action of the pressure plate, the medicinal liquid transfer hose being always opened; characterized in that said medicinal liquid supply apparatus further comprises: a double medicinal liquid hose whose one end is connected to an outlet of the fixed-type medicinal liquid supply volume controller, the double medicinal liquid hose having a branch tube connected to the medicinal liquid transfer hose; and an arbitrary medicinal liquid supply volume controller connected to the other end of the double medicinal liquid hose, the arbitrary medicinal liquid supply volume controller comprising: a medicinal liquid storing tube for storing the medicinal liquid, which is transferred through the branch tube of the double medicinal liquid hose, via a further branch tube therein; a check valve adapted to allow the medicinal liquid storing tube to temporarily store the medicinal liquid therein and prevent a back flow of the medicinal liquid; a button body adapted to pressurize the medicinal liquid storing tube to thereby arbitrarily and additionally supply the medicinal liquid through a second medicinal liquid hose; and a bypass tube connected to the double medicinal liquid hose for transferring the medicinal liquid transferred through the double medicinal liquid hose to the second medicinal liquid hose to thereby continuously supply the medicinal liquid. a fixed-type medicinal liquid supply volume controller connected to one end of a first medicinal liquid hose whose other end is connected to an outlet of a medicinal liquid supplier, the fixed-type medicinal liquid supply volume controller comprising: cases (41a; 41b); a medicinal liquid control line received inside the cases (41a; 41b); an inflow part and an outflow part respectively formed on the opposite ends of the medicinal liquid control line and respectively having a plurality of branch holes (43a; 44a); a controller joined to the outer face of the case (41 a or 41b); a pressure plate pressed according to a rotation angle of the controller and having a plurality of pressure pieces; and a plurality of medicinal liquid branch hoses and a medicinal liquid transfer hose respectively connected to the branch holes (43a; 44a), the medicinal liquid branch hoses being opened and closed by an action of the pressure plate, the medicinal liquid transfer hose being always opened; a double medicinal liquid hose whose one end is connected to an outlet of the fixed-type medicinal liquid supply volume controller, the double medicinal liquid hose having a branch tube connected to the medicinal liquid transfer hose; and an arbitrary medicinal liquid supply volume controller connected to the other end of the double medicinal liquid hose, the arbitrary medicinal liquid supply volume controller comprising: a medicinal liquid storing tube for storing the medicinal liquid, which is transferred through the branch tube of the double medicinal liquid hose, via a further branch tube therein; a check valve adapted to allow the medicinal liquid storing tube to temporarily store the medicinal liquid therein and prevent a back flow of the medicinal liquid; a button body adapted to pressurize the medicinal liquid storing tube to thereby arbitrarily and additionally supply the medicinal liquid through a second medicinal liquid hose; and a bypass tube connected to the double medicinal liquid hose for transferring the medicinal liquid transferred through the double medicinal liquid hose to the second medicinal liquid hose to thereby continuously supply the medicinal liquid.