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1. A canvas fixing device for an aluminum canvas frame, comprising: canvas frame bodies (1) each made of a lightweight metal by means of extrusion molding and having a hollow portion (11) formed therein, a fixing groove (12) formed on a rear surface thereof and having a support protrusion (121) protruding from a top side inlet thereof, a coupling groove (13) formed on the rear surface thereof under the fixing groove (12) and having a locking protrusion (131), and a support wall (14) formed between the fixing groove (12) and the coupling groove (13) and having a lower height than a rear wall thereof; and a plurality of fixing pins (2) molded with a thin plate and having a fixing protruding portion (21) and a plurality of wedge-shaped protrusions (211) formed on a top side thereof and an bent elastic portion (22) formed on a bottom side thereof, the elastic portion (22) having a support piece (226) formed by bending the bottom of the fixing pin (2), an elastic piece (221) formed by bending the end of the support piece (226), and an extension protrusion (223) extending from the elastic piece (221) and having a locking projection (222) protruding therefrom, wherein the wedge-shaped protrusions (211) of each fixing pin (2) are pressurized against a canvas (3) on the outside of an outer edge of the canvas (3) surrounding the corresponding canvas frame body (1) and pierce the canvas (3), so that ends of the wedge-shaped protrusions (211) are exposed from the other side of the canvas (3) and inserted into the fixing groove (12), and the elastic portion (22) of each fixing pin (2) is inserted into the coupling groove (13) to allow the locking projection (222) of the fixing pin (2) to be locked onto the locking protrusion (131), thereby allowing the canvas (3) to be fixed to the aluminum canvas frame (P).
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