A bidirectional self-locking damper, comprising a cylinder sealed with a work medium and a piston assembly housed in the cylinder and displaceable along the axial direction of the cylinder, characterized in that the piston assembly comprises: a piston rod, that comprises a working portion extending into the cylinder and a first mounting portion extending out of the cylinder; a piston that is connected to the working portion and divides the cylinder into a recovery pressure chamber and a compression pressure chamber; and a bidirectional self-locking valve that is connected to the working portion, the bidirectional self-locking valve comprising: a valve body that is provided with a passage chamber and a first passage channel and a second passage channel that are communicated with the passage chamber, the first passage channel communicating with the recovery pressure chamber, and the second passage channel communicating with the compression pressure chamber; a locking assembly that is placed in the passage chamber; wherein the locking assembly is directed to displace in the passage chamber driven by the work medium for establishing/interrupting the communication between the first passage channel or the second passage channel and the passage chamber; characterized in that the valve body comprises a valve seat and a valve cover; the passage chamber and the first passage channel are provided on the valve seat, and one end of the valve seat is provided with a locking groove communicating with the passage chamber; the second passage channel is provided on the valve cover; the valve cover comprises a base and an extension portion connected to one end of the base, the outer peripheral surface of the base is in sealing connection with the inner wall of the locking groove, and the end face of the base abuts against the bottom of the locking groove and forms a first sealing portion, and the extension portion is introduced into the passage chamber from one end of the base. a piston rod, that comprises a working portion extending into the cylinder and a first mounting portion extending out of the cylinder; a piston that is connected to the working portion and divides the cylinder into a recovery pressure chamber and a compression pressure chamber; and a bidirectional self-locking valve that is connected to the working portion, the bidirectional self-locking valve comprising: a valve body that is provided with a passage chamber and a first passage channel and a second passage channel that are communicated with the passage chamber, the first passage channel communicating with the recovery pressure chamber, and the second passage channel communicating with the compression pressure chamber; a locking assembly that is placed in the passage chamber; wherein the locking assembly is directed to displace in the passage chamber driven by the work medium for establishing/interrupting the communication between the first passage channel or the second passage channel and the passage chamber; characterized in that the valve body comprises a valve seat and a valve cover; the passage chamber and the first passage channel are provided on the valve seat, and one end of the valve seat is provided with a locking groove communicating with the passage chamber; the second passage channel is provided on the valve cover; the valve cover comprises a base and an extension portion connected to one end of the base, the outer peripheral surface of the base is in sealing connection with the inner wall of the locking groove, and the end face of the base abuts against the bottom of the locking groove and forms a first sealing portion, and the extension portion is introduced into the passage chamber from one end of the base. a valve body that is provided with a passage chamber and a first passage channel and a second passage channel that are communicated with the passage chamber, the first passage channel communicating with the recovery pressure chamber, and the second passage channel communicating with the compression pressure chamber; a locking assembly that is placed in the passage chamber; wherein the locking assembly is directed to displace in the passage chamber driven by the work medium for establishing/interrupting the communication between the first passage channel or the second passage channel and the passage chamber; characterized in that the valve body comprises a valve seat and a valve cover; the passage chamber and the first passage channel are provided on the valve seat, and one end of the valve seat is provided with a locking groove communicating with the passage chamber; the second passage channel is provided on the valve cover; the valve cover comprises a base and an extension portion connected to one end of the base, the outer peripheral surface of the base is in sealing connection with the inner wall of the locking groove, and the end face of the base abuts against the bottom of the locking groove and forms a first sealing portion, and the extension portion is introduced into the passage chamber from one end of the base.