A photovoltaic junction box adapted to be mounted on a solar panel, comprising: a box body; a plurality of conduction terminals (210, 220, 230, 240) received in the box body; and at least one surface-mounted diode (310, 320, 330) mounted on the plurality of conduction terminals (210, 220, 230, 240) by means of Surface Mount Technology, wherein each surface-mounted diode (310, 320, 330) comprises a flat body, at least one anode pin (311, 321, 331) extending outwardly from an edge of the flat body, and a cathode pad (312, 322, 332) located on a bottom of the flat body, wherein the cathode pad of at least one surface mounted diode mounted on a surface of the conduction terminal has a heat conduction angle γ, wherein an edge of at least one of the plurality of conduction terminals (210, 220, 230, 240) is formed with a notch recessed inward therefrom, the notch having a straight bottom edge, and a first lateral edge and a second lateral edge located on either side of the bottom edge, a first angle α being defined between the first lateral edge and the bottom edge, and a second angle β being defined between the second lateral edge and the bottom edge, and wherein the cathode pad (312, 322, 332) of the at least one surface-mounted diode (310, 320, 330) is surface-mounted on the conduction terminal (210, 220, 230, 240) with the notch, a front edge of the cathode pad (312, 322, 332) being substantially aligned with the bottom edge of the notch so as to increase the heat conduction angle γ of the cathode pad (312, 322, 332), wherein the heat conduction angle γ is calculated by the following expression: γ = 540 degrees − α − β, wherein the heat conduction angle γ is more than 180 degrees and less than 360 degrees. a box body; a plurality of conduction terminals (210, 220, 230, 240) received in the box body; and at least one surface-mounted diode (310, 320, 330) mounted on the plurality of conduction terminals (210, 220, 230, 240) by means of Surface Mount Technology, wherein each surface-mounted diode (310, 320, 330) comprises a flat body, at least one anode pin (311, 321, 331) extending outwardly from an edge of the flat body, and a cathode pad (312, 322, 332) located on a bottom of the flat body, wherein the cathode pad of at least one surface mounted diode mounted on a surface of the conduction terminal has a heat conduction angle γ, wherein an edge of at least one of the plurality of conduction terminals (210, 220, 230, 240) is formed with a notch recessed inward therefrom, the notch having a straight bottom edge, and a first lateral edge and a second lateral edge located on either side of the bottom edge, a first angle α being defined between the first lateral edge and the bottom edge, and a second angle β being defined between the second lateral edge and the bottom edge, and wherein the cathode pad (312, 322, 332) of the at least one surface-mounted diode (310, 320, 330) is surface-mounted on the conduction terminal (210, 220, 230, 240) with the notch, a front edge of the cathode pad (312, 322, 332) being substantially aligned with the bottom edge of the notch so as to increase the heat conduction angle γ of the cathode pad (312, 322, 332), wherein the heat conduction angle γ is calculated by the following expression: γ = 540 degrees − α − β, wherein the heat conduction angle γ is more than 180 degrees and less than 360 degrees.