A cashbox, comprising a front surface, a back surface, a left surface, a right surface, a bottom surface, and a top surface, characterized in that, the cashbox comprises: a left shell, comprising: a first side wall forming the left surface, a second side wall partially extending across the front surface, and a third side wall partially extending across the bottom surface; a right shell, comprising: a fourth side wall forming the right surface, a fifth side wall partially extending across the front surface, and a sixth side wall partially extending across the bottom surface; a first fixing panel, fixedly connected to the second side wall and the fifth side wall which are located at the inner side of the first fixing panel through screws, so as to form the front surface together with the second side wall and the fifth side wall; a second fixing panel, fixedly connected to the third side wall and the sixth side wall which are located at the inner side of the second fixing panel through screws, so as to form the bottom surface together with the third side wall and the sixth side wall; an upper cover with a money entrance, forming the top surface, and being inserted with the left shell and the right shell; and a box door fixing panel and a box door which is pivotally connected to the box door fixing panel through a pivot shaft, the box door fixing panel and the box door forming the back surface of the cashbox together, wherein, the box door fixing panel is inserted with the left shell and the right shell, and the box door is connected with the upper cover through a security lock, wherein, all the screws are installed from the inside of the cashbox; wherein, the cashbox further comprises: a money pressing assembly located on the lower surface of the upper cover; and a paper money supporting plate assembly located in the cashbox, wherein, the paper money supporting plate assembly comprises: a supporting plate adapted to the money pressing assembly and an elastic element which elastically supports the supporting plate. a left shell, comprising: a first side wall forming the left surface, a second side wall partially extending across the front surface, and a third side wall partially extending across the bottom surface; a right shell, comprising: a fourth side wall forming the right surface, a fifth side wall partially extending across the front surface, and a sixth side wall partially extending across the bottom surface; a first fixing panel, fixedly connected to the second side wall and the fifth side wall which are located at the inner side of the first fixing panel through screws, so as to form the front surface together with the second side wall and the fifth side wall; a second fixing panel, fixedly connected to the third side wall and the sixth side wall which are located at the inner side of the second fixing panel through screws, so as to form the bottom surface together with the third side wall and the sixth side wall; an upper cover with a money entrance, forming the top surface, and being inserted with the left shell and the right shell; and a box door fixing panel and a box door which is pivotally connected to the box door fixing panel through a pivot shaft, the box door fixing panel and the box door forming the back surface of the cashbox together, wherein, the box door fixing panel is inserted with the left shell and the right shell, and the box door is connected with the upper cover through a security lock, wherein, all the screws are installed from the inside of the cashbox; wherein, the cashbox further comprises: a money pressing assembly located on the lower surface of the upper cover; and a paper money supporting plate assembly located in the cashbox, wherein, the paper money supporting plate assembly comprises: a supporting plate adapted to the money pressing assembly and an elastic element which elastically supports the supporting plate. a money pressing assembly located on the lower surface of the upper cover; and a paper money supporting plate assembly located in the cashbox, wherein, the paper money supporting plate assembly comprises: a supporting plate adapted to the money pressing assembly and an elastic element which elastically supports the supporting plate.