The invention provides a stirrer (100) for a grouting agent test and a stirring method. The stirrer (100) comprises a shell (123), a pot body (3), a blade assembly (6), a first motor (1) and a second motor (2), wherein the pot body (3) is arranged in the shell (123); the blade assembly (6) is arranged in the pot body (3); the first motor (1) is used for driving a transmission shaft (13) to rotate; the transmission shaft (13) is used for driving the blade assembly (6) to rotate; the second motor (2) is used for driving the pot body (3) to rotate; a central pivot shaft (14) is arranged in the center of the pot body (3), so that the cross section of the pot body (3) is annular; the blade assembly (6) comprises upper and lower blades (61 and 62); the distance among the outer end surfaces of the upper and lower blades, the inner wall of the pot body (3) and the outer wall of the central pivot shaft (14) is 1 to 3mm; the distance between the lower blade (62) and the bottom of the pot body (3) is 1 to 3mm; the upper blade (61) is arranged at a position 1 to 3mm below the surface of mixture slurry in the pot body (3). According to the stirrer, high-speed and uniform stirring can be realized, so that the test process can be conveniently and quickly completed.