The invention relates to an all-purpose triangular support installed on a container. The all-purpose triangular support comprises triangular support supporting feet, a support base and permanent powerful magnets, an all-purpose clamp is installed on the support base, and the permanent powerful magnets are installed on the bottom ends of the triangular support supporting feet. The all-purpose triangular support is characterized in that the direction and the length of the triangular support are adjustable, the direction of the all-purpose clamp on the base is adjustable according to the appearance and the direction of an article to be installed and fixed, the directions of the contact faces of the permanent powerful magnets at the bottom ends of the supporting feet are adjustable, and the powerful magnets at the bottom ends of the triangular support supporting feet are fixedly connected with the container.