The invention provides a pot cover assembly of a pressure pot and a pressure pot. The pot cover assembly includes: a pot cover, wherein a pot cover guide hole is formed in the pot cover; a guiding member arranged on the pot cover, wherein the guiding member includes a first guiding portion, a second guiding portion and a first connection portion connecting the first guiding portion and the secondguiding portion which are integrally formed and form a guiding chamber, and a guiding hole corresponding to the pot cover guide hole is formed in the second guiding portion; a sliding block arranged in the guiding chamber, wherein the guiding chamber is used for limiting the degree of freedom of vertical motion and horizontal swing of the sliding block; a self-locking pin arranged on the sliding block, wherein two ends of the self-locking pin pass through the pot cover guide hole and the guiding hole respectively; a floater, wherein a limiting portion is arranged on a part corresponding to thefloater, of the sliding block, and the limiting portion is configured to limit the degree of freedom of horizontal motion of the sliding block with the floater while the floater floats. The technicalscheme can effectively guide and limit motion of the sliding block in the guiding member, and can avoid the problem that when the floater floats, the sliding block can still slide under a small forceand the pot cover is opened.