Disclosed by the present application are a cradle head handle and a handheld cradle head mechanism. The tripod head handle comprises a handle body, a hand grip and a locking mechanism. The hand grip may be detachably assembled to the handle body. A clamping groove is formed on one of the handle body and the hand grip, and a first abutting wall extending obliquely relative to a bottom surface of the clamping groove is arranged in the clamping groove. The locking mechanism is arranged on the other one of the handle body and the hand grip and at least partially extends into the clamping groove when the handle body and the hand grip are engaged. The locking mechanism comprises a second abutting wall extending obliquely relative to the bottom surface of the clamping groove, and the locking mechanism moves relative to the clamping groove so that the first abutting wall and the second abutting wall abut against each other or separate from each other, thereby assembling and disassembling the handle body and the hand grip.