Pipe expander, with a main body (10) having a base portion (11) and a grip portion (12) extending outward from the base portion (11), the base portion (11) being provided with a sliding hole (131), the extension line of the The central axis of the sliding hole (131) defines a center line, the base portion (11) having a first hinge part; a pressure lever (20) which has two opposite ends, which are a hinge end (21) and a pressure end (22), the hinge end (21) having a second hinge part, the second hinge part and the first hinge part being articulated to one another, the hinge end (21) further having a third hinge part; a tube widening element (30) which is slidably arranged in the sliding hole (131) and has a sliding section (31) and a conical section (32), the conical section (32) at the end of the sliding section (31) facing away from the pressure lever (20) is located and protrudes from the sliding hole (131), the outer diameter of the conical section (32) decreasing in the opposite direction of the sliding section (31), the sliding section (31) having a fourth hinge part; and a connecting rod (40) disposed between the hinge end (21) of the pressure lever (20) and the sliding portion (31) of the tube expander (30), the opposite two ends of which are hingedly connected to the third hinge part and the fourth hinge part; wherein, when the pressing end (22) of the pressing lever (20) is pressed in the direction of the grip portion (12) of the main body (10), the hinge end (21) through the connecting rod (40) the tube expander element (30) in the opposite direction of the pressing lever ( 20) pushes so that the conical section (32) protrudes further from the sliding hole (131).
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