The heating pad includes: a control box, the control box includes an upper cover, a universal serial bus (USB) control board, a constant current control board, a wire, an LED lamp, a plurality of screws and a lower cover； a upper layer, the upper layer includes an outer layer and an inner layer； a foam； a heating piece； a lower layer.The universal serial bus (USB) control board can be connected to the universal serial bus (USB) port or an action power supply of the computer, and can receive the power supply of the computer or action power supply. The DC control board can be connected to an AC / DC transformer to receive the power supply of the general power supply. The wire is connected to the heating piece. The control box receives the power through the universal serial bus (USB) control board or the DC control board. After the current is flowing, the current can be transmitted to the heating piece through the wire, so that the heating piece is heated and the heating effect is achieved.一種發熱墊，該發熱墊包含：一控制盒，該控制盒包括一上蓋，一通用序列匯流排(USB)控制板，一直流電控制板，一導線，一LED燈，複數個螺絲及一下蓋；一上層，該上層包括一外層及一內層；一泡棉；一發熱片；一下層。該通用序列匯流排(USB)控制板可連接電腦之通用序列匯流排(USB)埠或一行動電源，接受電腦或行動電源之供電，該直流電控制板可連接一交直流變壓器，接受一般電源之供電，該導線連接該發熱片，該控制盒透過該通用序列匯流排(USB)控制板或該直流電控制板接受電流後，可透過該導線將電流傳輸至該發熱片，使該發熱片發熱，達到發熱之效果。
