A hemispherical camera, comprising: a lens component; an upper cover component comprising a hemispherical transparent hood, which hoods the lens component; a cylindrical base supporting the lens component and the upper cover component; a cylindrical wire hidden case supporting the base, wherein a surface of the wire hidden case in contact with the base is provided with a through hole for receiving a wire of the lens component through the base; wherein, a circumferential edge of the surface of the wire hidden case is provided with teeth, and the wire hidden case is defined such that: when the wire hidden case is in non-fastened connection with the base, the base drives the lens component to rotate in the P-direction relative to the wire hidden case, so that the lens component rotates to a preset angle; when the wire hidden case is in fastened connection with the base, the teeth of the wire hidden case prevent the base from rotating in the P-direction, so that the lens component is defined at the preset angle, wherein, the base and the wire hidden case have a same first axis; the rotating in the P-direction refers to a horizontal rotation around the first axis, wherein, the hemispherical camera also comprises a pin; when the wire hidden case is in fastened connection with the base, the pin contacts the teeth; when the wire hidden case is in non-fastened connection with the base, the pin is loosened from the teeth, wherein, the pin passes through the base along a direction parallel to the first axis, wherein, when the upper cover component is in non-fastened connection with the base, the pin is loosened from the teeth; when the upper cover component is in fastened connection with the base, the pin contacts the teeth, wherein, an edge of the upper cover component comprises a raised part, which extends towards the base; when the upper cover component is in fastened connection with the base, the pin is subjected to a pressure applied by the raised part so that the pin contacts the teeth. a lens component; an upper cover component comprising a hemispherical transparent hood, which hoods the lens component; a cylindrical base supporting the lens component and the upper cover component; a cylindrical wire hidden case supporting the base, wherein a surface of the wire hidden case in contact with the base is provided with a through hole for receiving a wire of the lens component through the base; wherein, a circumferential edge of the surface of the wire hidden case is provided with teeth, and the wire hidden case is defined such that: when the wire hidden case is in non-fastened connection with the base, the base drives the lens component to rotate in the P-direction relative to the wire hidden case, so that the lens component rotates to a preset angle; when the wire hidden case is in fastened connection with the base, the teeth of the wire hidden case prevent the base from rotating in the P-direction, so that the lens component is defined at the preset angle, wherein, the base and the wire hidden case have a same first axis; the rotating in the P-direction refers to a horizontal rotation around the first axis, wherein, the hemispherical camera also comprises a pin; when the wire hidden case is in fastened connection with the base, the pin contacts the teeth; when the wire hidden case is in non-fastened connection with the base, the pin is loosened from the teeth, wherein, the pin passes through the base along a direction parallel to the first axis, wherein, when the upper cover component is in non-fastened connection with the base, the pin is loosened from the teeth; when the upper cover component is in fastened connection with the base, the pin contacts the teeth, wherein, an edge of the upper cover component comprises a raised part, which extends towards the base; when the upper cover component is in fastened connection with the base, the pin is subjected to a pressure applied by the raised part so that the pin contacts the teeth. when the wire hidden case is in non-fastened connection with the base, the base drives the lens component to rotate in the P-direction relative to the wire hidden case, so that the lens component rotates to a preset angle; when the wire hidden case is in fastened connection with the base, the teeth of the wire hidden case prevent the base from rotating in the P-direction, so that the lens component is defined at the preset angle, wherein, the base and the wire hidden case have a same first axis; the rotating in the P-direction refers to a horizontal rotation around the first axis, wherein, the hemispherical camera also comprises a pin; when the wire hidden case is in fastened connection with the base, the pin contacts the teeth; when the wire hidden case is in non-fastened connection with the base, the pin is loosened from the teeth, wherein, the pin passes through the base along a direction parallel to the first axis, wherein, when the upper cover component is in non-fastened connection with the base, the pin is loosened from the teeth; when the upper cover component is in fastened connection with the base, the pin contacts the teeth, wherein, an edge of the upper cover component comprises a raised part, which extends towards the base; when the upper cover component is in fastened connection with the base, the pin is subjected to a pressure applied by the raised part so that the pin contacts the teeth.